- From: Mercurial notifier <cvsmail@w3.org>
- Date: Mon, 01 Oct 2012 18:41:57 +0000
- To: public-dap-commits@w3.org
changeset: 234:65b5e15e8b37
parent: 232:32487cf058c5
user: Frederick Hirsch <frederick.hirsch@nokia.com>
date: Thu Sep 27 10:40:19 2012 -0400
files: wi-addendum-local-services/FPWD/FPWD.html wi-addendum-local-services/FPWD/FPWD_src.html
description:
changed shortname to not have spaces, and to be short and meaningful - "webintents-local-services"
diff -r 32487cf058c5 -r 65b5e15e8b37 wi-addendum-local-services/FPWD/FPWD.html
--- a/wi-addendum-local-services/FPWD/FPWD.html Wed Sep 26 14:47:02 2012 +0200
+++ b/wi-addendum-local-services/FPWD/FPWD.html Thu Sep 27 10:40:19 2012 -0400
@@ -1,990 +1,989 @@
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- <body><div class="head">
- <p>
-
- <a href="http://www.w3.org/"><img width="72" height="48" src="http://www.w3.org/Icons/w3c_home" alt="W3C"></a>
-
- </p>
- <h1 class="title" id="title">Web Intents Addendum - Local Services</h1>
-
- <h2 id="w3c-working-draft-27-september-2012"><abbr title="World Wide Web Consortium">W3C</abbr> Working Draft 27 September 2012</h2>
- <dl>
-
- <dt>This version:</dt>
- <dd><a href="http://www.w3.org/TR/2012/WD-Web Intents-LD addendum-20120927/">http://www.w3.org/TR/2012/WD-Web Intents-LD addendum-20120927/</a></dd>
- <dt>Latest published version:</dt>
- <dd><a href="http://www.w3.org/TR/Web Intents-LD addendum/">http://www.w3.org/TR/Web Intents-LD addendum/</a></dd>
-
-
- <dt>Latest editor's draft:</dt>
- <dd><a href="http://w3c-test.org/dap/wi-addendum-local-services/">http://w3c-test.org/dap/wi-addendum-local-services/</a></dd>
-
-
-
-
-
-
- <dt>Editors:</dt>
- <dd><span>Claes Nilsson</span>, <a href="http://www.sonymobile.com/se/">Sony Mobile</a></dd>
-<dd><span>Norifumi Kikkawa</span>, <a href="http://www.sony.net/">Sony Corporation</a></dd>
-
-
- </dl>
-
-
-
-
-
- <p class="copyright">
- <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> ©
- 2012
-
- <a href="http://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup>
- (<a href="http://www.csail.mit.edu/"><abbr title="Massachusetts Institute of Technology">MIT</abbr></a>,
- <a href="http://www.ercim.eu/"><abbr title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>,
- <a href="http://www.keio.ac.jp/">Keio</a>), All Rights Reserved.
- <abbr title="World Wide Web Consortium">W3C</abbr> <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>,
- <a href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and
- <a href="http://www.w3.org/Consortium/Legal/copyright-documents">document use</a> rules apply.
- </p>
-
-
- <hr>
-</div>
- <section id="abstract" class="introductory"><h2>Abstract</h2><p>
- This specification is an addendum to Web Intents, [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>], that defines how Web Intents enabled User Agents can discover and communicate
- with local Web Intents Services.
- </p></section><section id="sotd" class="introductory"><h2>Status of This Document</h2>
-
-
-
- <p>
- <em>This section describes the status of this document at the time of its publication. Other
- documents may supersede this document. A list of current <abbr title="World Wide Web Consortium">W3C</abbr> publications and the latest revision
- of this technical report can be found in the <a href="http://www.w3.org/TR/"><abbr title="World Wide Web Consortium">W3C</abbr> technical reports
- index</a> at http://www.w3.org/TR/.</em>
- </p>
-
- <p>
- This document was published by the <a href="http://www.w3.org/2009/dap/">DAP/Web Apps Web Intents task force</a> as a First Public Working Draft.
-
- This document is intended to become a <abbr title="World Wide Web Consortium">W3C</abbr> Recommendation.
-
- If you wish to make comments regarding this document, please send them to
- <a href="mailto:public-web-intents@w3.org">public-web-intents@w3.org</a>
- (<a href="mailto:public-web-intents-request@w3.org?subject=subscribe">subscribe</a>,
- <a href="http://lists.w3.org/Archives/Public/public-web-intents/">archives</a>).
-
-
- All feedback is welcome.
- </p>
-
- <p>
- Publication as a Working Draft does not imply endorsement by the <abbr title="World Wide Web Consortium">W3C</abbr> Membership.
- This is a draft document and may be updated, replaced or obsoleted by other documents at
- any time. It is inappropriate to cite this document as other than work in progress.
- </p>
-
-
- <p>
-
- This document was produced by a group operating under the
- <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004 <abbr title="World Wide Web Consortium">W3C</abbr> Patent Policy</a>.
-
-
-
-
- <abbr title="World Wide Web Consortium">W3C</abbr> maintains a <a href="" rel="disclosure">public list of any patent disclosures</a>
-
- made in connection with the deliverables of the group; that page also includes instructions for
- disclosing a patent. An individual who has actual knowledge of a patent which the individual believes contains
- <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential Claim(s)</a> must disclose the
- information in accordance with <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section
- 6 of the <abbr title="World Wide Web Consortium">W3C</abbr> Patent Policy</a>.
-
-
- </p>
-
-
-
-
-</section><section id="toc"><h2 class="introductory">Table of Contents</h2><ul class="toc"><li class="tocline"><a href="#introduction" class="tocxref"><span class="secno">1. </span>Introduction</a></li><li class="tocline"><a href="#conformance" class="tocxref"><span class="secno">2. </span>Conformance</a><ul class="toc"><li class="tocline"><a href="#dependencies" class="tocxref"><span class="secno">2.1 </span>Dependencies</a></li></ul></li><li class="tocline"><a href="#terminology" class="tocxref"><span class="secno">3. </span>Terminology</a><ul class="toc"><li class="tocline"><a href="#upnp-related-terms" class="tocxref"><span class="secno">3.1 </span>UPnP related terms</a></li><li class="tocline"><a href="#mdns-related-terms" class="tocxref"><span class="secno">3.2 </span>mDNS related terms</a></li></ul></li><li class="tocline"><a href="#upnp-adaptation" class="tocxref"><span class="secno">4. </span>UPnP adaptation</a><ul class="toc"><li class="tocline"><a href="#web-intents-enabled-upnp-device" class="tcxref"><span class="secno">4.1 </span><span class="formerLink">Web Intents enabled UPnP device</span></a><ul class="toc"><li class="tocline"><a href="#upnp-web-intents-servicetype" class="tocxref"><span class="secno">4.1.1 </span>UPnP Web Intents serviceType</a></li><li class="tocline"><a href="#web-intents-specific-ssdp-headers" class="tocxref"><span class="secno">4.1.2 </span>Web Intents specific SSDP headers</a></li><li class="tocline"><a href="#web-intents-document" class="tocxref"><span class="secno">4.1.3 </span>Web Intents document</a></li><li class="tocline"><a href="#web-intents-service-pages" class="tocxref"><span class="secno">4.1.4 </span>Web Intents Service pages</a></li></ul></li><li class="tocline"><a href="#upnp-enabled-user-agent" class="tocxref"><span class="secno">4.2 </span><span class="formerLink">UPnP enabled User Agent</span></a><ul class="toc"><li class="tocline"><a href="#dynamic-service-registration-based-on-m-search" class="tocxref"><span class="secno">4.2.1 </span>Dynamic Serviceregistration based on M-SEARCH</a></li><li class="tocline"><a href="#dynamic-service-registration-based-on-notify" class="tocxref"><span class="secno">4.2.2 </span>Dynamic Service registration based on NOTIFY</a></li><li class="tocline"><a href="#support-for-web-intents-and-upnp" class="tocxref"><span class="secno">4.2.3 </span>Support for Web Intents and UPnP</a></li><li class="tocline"><a href="#service-availability-management" class="tocxref"><span class="secno">4.2.4 </span>Service availability management</a></li></ul></li></ul></li><li class="tocline"><a href="#mdns-dns-sd-adaptation" class="tocxref"><span class="secno">5. </span>mDNS (DNS-SD) adaptation</a><ul class="toc"><li class="tocline"><a href="#web-intents-enabled-mdns-device" class="tocxref"><span class="secno">5.1 </span>Web Intents enabled mDNS device</a><ul class="toc"><li class="tocline"><a href="#web-intents-service-type-for-dns-sd" class="tocxref"><span class="secno">5.1.1 </span>Web Intents service type for DNS-SD</a></li></ul></li><li lass="tocline"><a href="#mdns-enabled-user-agent" class="tocxref"><span class="secno">5.2 </span>mDNS enabled User Agent</a><ul class="toc"><li class="tocline"><a href="#dynamic-service-registration" class="tocxref"><span class="secno">5.2.1 </span>Dynamic Service registration</a></li></ul></li><li class="tocline"><a href="#sample-records" class="tocxref"><span class="secno">5.3 </span>Sample Records</a></li></ul></li><li class="tocline"><a href="#apis-protocols-client---service" class="tocxref"><span class="secno">6. </span>APIs / protocols Client - Service </a></li><li class="tocline"><a href="#examples-and-scenarios" class="tocxref"><span class="secno">A. </span>Examples and scenarios</a><ul class="toc"><li class="tocline"><a href="#view-and-control-video-on-remote-device-through-service-page-control-buttons" class="tocxref"><span class="secno">A.1 </span>View and control video on remote device through Service page control buttons</a></li><li class="tocline"><a href="#view-and-control-video-on-remote-devce-through-client-page-control-buttons" class="tocxref"><span class="secno">A.2 </span>View and control video on remote device through Client page control buttons</a></li><li class="tocline"><a href="#example-of-web-intents-document" class="tocxref"><span class="secno">A.3 </span>Example of Web Intents document</a></li><li class="tocline"><a href="#example-of-upnp-device-description-document" class="tocxref"><span class="secno">A.4 </span>Example of UPnP Device description document</a></li></ul></li><li class="tocline"><a href="#acknowledgements" class="tocxref"><span class="secno">B. </span>Acknowledgements</a></li><li class="tocline"><a href="#references" class="tocxref"><span class="secno">C. </span>References</a><ul class="toc"><li class="tocline"><a href="#normative-references" class="tocxref"><span class="secno">C.1 </span>Normative references</a></li></ul></li></ul></section>
-
- <section class="informative" id="introduction">
- <!--OddPage--><h2><span class="secno">1. </span>Introduction</h2><p><em>This section is non-normative.</em></p>
- <p>
- Web Intents,[<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>], is a service discovery and light-weight RPC mechanism for web applications. The concept enables rich integration between web applications.
- A typical Web Intents scenario is:
- </p>
- <ol class="rule">
- <li>Web Intents Services register their intention to handle an action for the user </li>
- <li>A web application requests to start an action (share, edit, pick, view, ...)</li>
- <li>The user selects which service to handle the action</li>
- <li>The selected service executes the action</li>
- </ol>
- <p>
- A Web Intents Service is represented by a web page that declaratively marks itself as providing handling functionality for particular intents. Users register Web Intents Services
- by visiting web pages that contain registration markup.
- However, the strength of Web Intents is the ability to provide web applications with access to Services residing not only in the cloud but also in local environments.
- </p>
- <p>
- This specification defines optional extensions to Web Intents enabled User Agents to discover and dynamically register local Web Intents
- Services. Note that all details of the specific low level protocols used to discover and communicate with the local services are hidden to
- the Client Web Applications.
- </p>
- <p>
- The following code illustrates how a web application containing links to videos, can initiate video playback by creating and invoking a "video intent" as defined in [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>].
- This code is the same irrespective of whether the Service executing the intent action is a cloud based Service or a local Service.
- </p>
- <div class="example"><div class="example-title"><span>Example 1</span></div><pre class="example highlight prettyprint"><span class="com">// Create a new intent</span><span class="pln">
-</span><span class="kwd">var</span><span class="pln"> intent </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">Intent</span><span class="pun">(</span><span class="pln"> </span><span class="str">"http://webintents.org/view"</span><span class="pun">,</span><span class="str">"video/mp4"</span><span class="pun">,{</span><span class="pln"> </span><span class="str">"src"</span><span class="pun">:</span><span class="pln">videoCanvas</span><span class="pun">.</span><span class="pln">src</span><span class="pun">,</span><span class="pln"> </span><span class="str">"img"</span><span class="pun">:</span><span class="pln"> videoCanvas</span><span class="pun">.</span><span class="pln">poster</span><span class="pun">});</span><span class="pln">
-
-</span><span class="com">// Start intents picker </span><span class="pln">
-navigator</span><span class="pun">.</span><span class="pln">startActivity</span><span class="pun">(</span><span class="pln">intent</span><span class="pun">,</span><span class="pln">
- </span><span class="com">// On Result</span><span class="pln">
- </span><span class="kwd">function</span><span class="pun">(</span><span class="pln">intentData</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">console</span><span class="pun">.</span><span class="pln">log</span><span class="pun">(</span><span class="str">"player.html: On Result"</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> intentData</span><span class="pun">);},</span><span class="pln">
- </span><span class="com">// On Failure</span><span class="pln">
- </span><span class="kwd">function</span><span class="pun">(</span><span class="pln">intentData</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">console</span><span class="pun">.</span><span class="pln">log</span><span class="pun">(</span><span class="str">"player.html: On Failure"</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> intentData</span><span class="pun">);});</span></pre></div>
- <p>
- The example below briefly describes the steps taken when a Service on a local network, e.g. UPnP or mDNS, device is discovered and selected by
- the user.
- </p>
-
- <ol class="rule">
- <li>Triggered by navigator.startActivity the User Agent will start local network discovery of Web Intents Services.</li>
- <li>Replies from Web Intents enabled devices contain a URL to a Web Intents document, containing Web Intents Service registration
- markup, in the device. </li>
- <li>The Web Intents documents are retrieved by the User Agent and the dynamically registered Services are visible in the Web Intents Service picker. </li>
- <li>User selects Service.</li>
- <li>User Agent retrieves the Service page from the the Web Intents local network device and invokes it. </li>
- <li>The Service page handles the intent. </li>
- <li>When handling the intent is finished, the Service page issues window.intent.postResult and closes itself. </li>
- </ol>
-
- </section>
-
- <section id="conformance"><!--OddPage--><h2><span class="secno">2. </span>Conformance</h2>
-<p>
- As well as sections marked as non-normative, all authoring guidelines, diagrams, examples,
- and notes in this specification are non-normative. Everything else in this specification is
- normative.
-</p>
-<p>
- The key words <em class="rfc2119" title="must">must</em>, <em class="rfc2119" title="must not">must not</em>, <em class="rfc2119" title="required">required</em>, <em class="rfc2119" title="should">should</em>, <em class="rfc2119" title="should not">should not</em>, <em class="rfc2119" title="recommended">recommended</em>, <em class="rfc2119" title="may">may</em>,
- and <em class="rfc2119" title="optional">optional</em> in this specification are to be interpreted as described in [<cite><a class="bibref" href="#bib-RFC2119">RFC2119</a></cite>].
-</p>
-
- <p>
- This specification defines conformance criteria that apply to:
- </p>
- <ul class="rule">
- <li><dfn id="dfn-upnp-enabled-user-agent">UPnP enabled User Agent</dfn>: A <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> <em class="rfc2119" title="must">must</em> support Web Intents [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] and the conformance criteria
- stated in this specification. </li>
- <li><dfn id="dfn-web-intents-enabled-upnp-device">Web Intents enabled UPnP device</dfn>: A <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> <em class="rfc2119" title="must">must</em> support [<cite><a class="bibref" href="#bib-UPNP-DEVICEARCH">UPNP-DEVICEARCH</a></cite>] and the conformance criteria
- stated in this specification. </li>
- <li><dfn id="dfn-mdns-enabled-user-agent">mDNS enabled User Agent</dfn>: An <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> <em class="rfc2119" title="must">must</em> support Web Intents [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] and the conformance criteria
- stated in this specification. </li>
- <li><dfn id="dfn-web-intents-enabled-mdns-device">Web Intents enabled mDNS device</dfn>: A <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a> <em class="rfc2119" title="must">must</em> support [<cite><a class="bibref" href="#bib-DNS-SD">DNS-SD</a></cite>], [<cite><a class="bibref" href="#bib-MDNS">MDNS</a></cite>] and the conformance criteria
- stated in this specification. </li>
- </ul>
-
- <p>
- Implementations that use ECMAScript to implement the APIs defined in
- this specification must implement them in a manner consistent with the
- ECMAScript Bindings defined in the Web IDL specification [<cite><a class="bibref" href="#bib-WEBIDL">WEBIDL</a></cite>],
- as this specification uses that specification and terminology.
- </p>
- <section id="dependencies">
- <h3><span class="secno">2.1 </span>Dependencies</h3>
- <p>
- This specification relies on the following specifications:
- </p>
-
- <dl>
- <dt>Web Intents</dt>
- <dd>This addendum specification is dependent on and defines optional extensions to the basic Web Intents specification, [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>]. </dd>
- <dt>UPnP Device Architecture 1.0</dt>
- <dd>This addendum specification is dependent on and defines vendor specific extensions to the UPnP Device Architecture 1.0 specification, [<cite><a class="bibref" href="#bib-UPNP-DEVICEARCH">UPNP-DEVICEARCH</a></cite>]. </dd>
- <dt>IANA Service Name and Transport Protocol Port Number Registry</dt>
- <dd>This addendum specification adds new entry on it, [<cite><a class="bibref" href="#bib-IANA-SRVPORT-REG">IANA-SRVPORT-REG</a></cite>]. </dd>
- <dt>DNS-SD</dt>
- <dd>This addendum specification is dependent on it, [<cite><a class="bibref" href="#bib-DNS-SD">DNS-SD</a></cite>]. </dd>
- <dt>mDNS</dt>
- <dd>This addendum specification is dependent on it, [<cite><a class="bibref" href="#bib-MDNS">MDNS</a></cite>]. </dd>
- </dl>
-
-
- </section>
- </section>
-
- <section id="terminology">
- <!--OddPage--><h2><span class="secno">3. </span>Terminology</h2>
- <p>
- Web Intents related terms are used according to section "Terminology" in [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>].
- </p>
-
- <section id="upnp-related-terms">
- <h3><span class="secno">3.1 </span>UPnP related terms</h3>
- <p>
- UPnP related terms are used according to [<cite><a class="bibref" href="#bib-UPNP-DEVICEARCH">UPNP-DEVICEARCH</a></cite>].
- </p>
- <p>
- The <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> has the role of a <dfn id="dfn-control-point">control point</dfn> according to UPnP terminology.
- </p>
- <p>
- The <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> discovered by the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> has the roles of <dfn id="dfn-device">device</dfn> according to UPnP terminology.
- </p>
- </section>
-
- <section id="mdns-related-terms">
- <h3><span class="secno">3.2 </span>mDNS related terms</h3>
- <p>
- The <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> has the role of a <dfn id="dfn-DNS-client">DNS client</dfn> with capability of [<cite><a class="bibref" href="#bib-DNS-SD">DNS-SD</a></cite>].
- </p>
- <p>
- The <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a> discovered by the <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> has the roles of <dfn id="dfn-service">service</dfn> according to [<cite><a class="bibref" href="#bib-MDNS">MDNS</a></cite>] and [<cite><a class="bibref" href="#bib-DNS-SD">DNS-SD</a></cite>].
- </p>
- </section>
-
-
- </section>
-
- <section id="upnp-adaptation">
-
- <!--OddPage--><h2><span class="secno">4. </span>UPnP adaptation</h2>
-
- <section id="web-intents-enabled-upnp-device">
-
- <h3><span class="secno">4.1 </span><a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a></h3>
-
- <p>
- The <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> <em class="rfc2119" title="must">must</em> support this section.
- </p>
-
- <section id="upnp-web-intents-servicetype">
-
- <h4><span class="secno">4.1.1 </span>UPnP Web Intents serviceType</h4>
-
- <p>
- The <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> <em class="rfc2119" title="must">must</em> support one UPnP service which serviceType is the <code>urn:schemas-webintents-org:service:WebIntents:1</code>
- as a vendor specific serviceType according to [<cite><a class="bibref" href="#bib-UPNP-DEVICEARCH">UPNP-DEVICEARCH</a></cite>]. It is vendor dependent how the <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> implements the serviceType,
- i.e. a device description of any deviceType could include this serviceType.
- </p>
-
- <p>
- The Web Intents serviceType <em class="rfc2119" title="must">must</em> have a dummy state variable, <code>X_State</code> of <code>boolean</code> data type to comform to [<cite><a class="bibref" href="#bib-UPNP-DEVICEARCH">UPNP-DEVICEARCH</a></cite>]
- which requires one or more state variables in a serviceType. The <code>X_State</code> state variable is not used with a value and is never evented.
- </p>
- <p>
- The Web Intents serviceType has no standard action.
- </p>
-
- <p>
- See below for the UPnP Service description document of the Web Intents serviceType.
- </p>
-
- <p><img src="Example_device_and_service_description_pages/Slide2.png" alt="Service description page" width="600" height="600"><br>
- (<a href="Example_device_and_service_description_pages/Slide2.png">View as PNG</a>)
- </p>
-
-
- </section>
-
- <section id="web-intents-specific-ssdp-headers">
-
- <h4><span class="secno">4.1.2 </span>Web Intents specific SSDP headers</h4>
-
- <p>
- The <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> <em class="rfc2119" title="must">must</em> support SSDP discovery process based on standard UPnP Discovery extended with 2 additional
- SSDP headers for M-SEARCH response and NOTIFY when ST/NT headers are:<code>urn:schemas-webintents-org:service:WebIntents:1</code>
- </p>
-
- <ul class="rule">
- <li>
- <code>location.webintents.org</code>: <em class="rfc2119" title="required">required</em>. States the location to the Web Intents document in the <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a>.
- If the value of this header is a relative URL the base URL is the base URL of the <code>LOCATION</code> header.
- </li>
- <li>
- <code>action.webintents.org</code>: <em class="rfc2119" title="optional">optional</em>. If supported, states the Web Intents
- <code>action</code> of the supported Web Intents Services and <em class="rfc2119" title="must">must</em>
- match the <code>action</code> attributes of the Service registration markup in the Web Intents document. To support more than
- one Web Intents <code>action</code> the action strings <em class="rfc2119" title="must">must</em> be separated with
- comma. Commas included in action strings <em class="rfc2119" title="must">must</em> be percent-encoded as
- defined in [<cite><a class="bibref" href="#bib-RFC3986">RFC3986</a></cite>], section-2.1.
- <br>
- This header allows the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> to filter received SSDP messages so that the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> only has to
- retrieve Web Intents documents for matching Web Intents Actions.
- </li>
- </ul>
-
- </section>
-
- <section id="web-intents-document">
-
- <h4><span class="secno">4.1.3 </span>Web Intents document</h4>
-
- <p>
- The <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> <em class="rfc2119" title="must">must</em> host Web Intents documents for the Web Intents Services the <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> supports.
- Web Intents documents are html pages that contain Web Intents Service registration markup according to the rules for Web Intents Service registration defined
- by [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>]. They may also contain Service handler code for Services registered within the same document.
- </p>
-
- </section>
-
- <section id="web-intents-service-pages">
-
- <h4><span class="secno">4.1.4 </span>Web Intents Service pages</h4>
-
- <p>
- The <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> <em class="rfc2119" title="must">must</em> host a Web Intents Service page for each Service that is
- referred in Web Intents documents through <code>href</code> attributes in the registration markup.
- </p>
- <p>
- Service pages contain Service handler code and fulfills the rules for Web Intents Services as defined by [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>].
- </p>
-
- </section>
-
- </section>
-
- <section id="upnp-enabled-user-agent">
-
- <h3><span class="secno">4.2 </span><a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a></h3>
-
- <p>
- The <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> <em class="rfc2119" title="must">must</em> support discovery of <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a>s through SSDP Discovery or through Advertisement
- or through both methods according to [<cite><a class="bibref" href="#bib-UPNP-DEVICEARCH">UPNP-DEVICEARCH</a></cite>] and according to the Web Intents serviceType and Web Intents specific SSDP headers
- defined in this specification, section 4.1.
- </p>
-
- <p>
- The sections below describe typical steps using these methods.
- </p>
-
- <section class="informative" id="dynamic-service-registration-based-on-m-search">
- <h4><span class="secno">4.2.1 </span>Dynamic Service registration based on M-SEARCH</h4><p><em>This section is non-normative.</em></p>
-
- <p>
- The section describes the discovery process based on standard UPnP M-SEARCH multicast request.
- </p>
-
- <p>
- When the navigator.startActivity method [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] is called, the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> runs the following steps:
- </p>
-
- <ol class="rule">
- <li>
- Send a multicast request with the method M-SEARCH in the format specified by [<cite><a class="bibref" href="#bib-UPNP-DEVICEARCH">UPNP-DEVICEARCH</a></cite>].
- <br>
- The <code>ST</code> header is set to: <code>urn:schemas-webintents-org:service:WebIntents:1</code>
- </li>
-
- <li>
- For each matching M-SEARCH response, i.e. the response ST header is <code>urn:schemas-webintents-org:service:WebIntents:1</code> and the <code>action.webintents.org</code>
- header, if present, matches the Action of the invoked intent,
- the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> attempts to retrieve the Web Intents document from the discovered <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a>.
- The value of the <code>location.webintents.org</code> header is the location for the Web Intents document.
- If this value is a relative URL the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> uses the base URL of the <code>LOCATION</code> header as base URL for the location of the
- Web Intents document.
- <br> <br>
- If the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> fails to retrieve the Web Intents document it silently disregards the received M-SEARCH response.
- <br> <br>
- If the <code>action.webintents.org</code> header is present and does not match the <code>action</code> attributes of the Services registered in the retrieved Web Intents
- document the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> silently disregards the the received M-SEARCH response.
- </li>
-
- <li>
- It is expected that the Web Intents document contains registration markup and the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> interprets this
- registration markup according to the rules for registration defined by [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] and register the Services accordingly.
- </li>
-
- <li>
- The <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> makes each dynamically registered Service, that matches the Action of the invoked intent, available for selection
- by the user, typically by making them visible and selectable in a Web Intents Service picker.
- </li>
-
- <li>
- Based on user selection of a dynamically registered Service the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> loads the
- Service handler code as defined by the <code>href</code> attribute in the registration markup for this Service according to the rules for
- loading Service pages defined in [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>].
- </li>
-
- </ol>
-
- </section>
-
- <section class="informative" id="dynamic-service-registration-based-on-notify">
- <h4><span class="secno">4.2.2 </span>Dynamic Service registration based on NOTIFY</h4><p><em>This section is non-normative.</em></p>
- <p>
- This section describes the discovery process based on standard UPnP Advertisement with NOTIFY message.
- </p>
-
- <p>
- The <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> <em class="rfc2119" title="may">may</em> continuously listen to and act on advertisments according to the following steps:
- </p>
- <ol class="rule">
-
- <li>
- The <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> maintains a list of announced UPnP services based on received SSDP NOTIFY messages
- with <code>NT</code> header equal to <code>urn:schemas-webintents-org:service:WebIntents:1</code>.
- </li>
-
- <li>
- When the navigator.startActivity method [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] is called the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> checks the list
- of of announced services and attempts to retrieve the Web Intents document from the discovered <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> in the following cases:
- <ul>
- <li>
- The received NOTIFY message contains an <code>action.webintents.org</code> header and this header matches the Action of the invoked intent.
- </li>
- <li>
- The received NOTIFY message does not contain an <code>action.webintents.org</code> header.
- </li>
- </ul>
- <br>
- The location of the Web Intents document is the value of the <code>location.webintents.org</code> header. If this value is a relative URL the
- base URL is the base URL of the <code>LOCATION</code> header.
- <br> <br>
- If the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> fails to retrieve the Web Intents document it silently disregards the received NOTIFY message.
- <br> <br>
- If the <code>action.webintents.org</code> header does not match the <code>action</code> attribute in the retrieved Web Intents document
- the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> silently disregards the received NOTIFY message.
- </li>
-
- <li>
- It is expected that the Web Intents document contains registration markup and the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> interprets the
- Web Intents document according to the rules for registration defined by [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] and register the Services accordingly.
- </li>
-
- <li>
- The <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> makes each dynamically registered Service, that matches the Action of the invoked intent, available for selection
- by the user, typically by making them visible and selectable in a Web Intents Service picker.
- </li>
-
- <li>
- Based on user selection of a dynamically registered Service the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> loads the
- Service handler code as defined by the <code>href</code> attribute in the registration markup for this Service according to the rules for
- loading Service pages defined in [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>].
- </li>
- </ol>
-
- <div class="note"><div class="note-title"><span>Note</span></div><p class="">
- Power consumption in battery powered devices should be considered. If power consumption is severe continuously listening to SSDP advertisement in the background
- should not be used..
- </p></div>
-
- </section>
-
- <section class="informative" id="support-for-web-intents-and-upnp">
- <h4><span class="secno">4.2.3 </span>Support for Web Intents and UPnP</h4><p><em>This section is non-normative.</em></p>
- <p>
- In addition to the normative statements defined in this specification a <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> that complies to this specification
- supports Web Intents according to [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] and UPnP Discovery, Description and Control according to [<cite><a class="bibref" href="#bib-UPNP-DEVICEARCH">UPNP-DEVICEARCH</a></cite>].
- However, it is implementation dependent whether this is supported natively in the User Agent or supported through some external component,
- e.g. an in-device web server.
- </p>
- </section>
-
- <section class="informative" id="service-availability-management">
-
- <h4><span class="secno">4.2.4 </span>Service availability management</h4><p><em>This section is non-normative.</em></p>
-
- <p>
- The <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> should manage the availability of UPnP services. For example detect when contact with a <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> is lost through standard
- UPnP life cycle management and remove a previously discovered and registered Service from the Service picker. However, for battery powered devices
- power consumption should be considered and long lasting "keep alive" sessions" should be avoided.
- </p>
-
- </section>
-
- </section>
-
-
-
- </section>
-
- <section id="mdns-dns-sd-adaptation">
-
- <!--OddPage--><h2><span class="secno">5. </span>mDNS (DNS-SD) adaptation</h2>
-
- <p>
- This section describes how the User Agent handles Web Intents Services provided by local devices supporting mDNS and DNS-SD.
- </p>
-
- <section id="web-intents-enabled-mdns-device">
-
- <h3><span class="secno">5.1 </span>Web Intents enabled mDNS device</h3>
-
- <p>
- The <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a> <em class="rfc2119" title="must">must</em> support this section.
- </p>
-
- <section id="web-intents-service-type-for-dns-sd">
-
- <h4><span class="secno">5.1.1 </span>Web Intents service type for DNS-SD</h4>
-
- <p>
- The <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a> <em class="rfc2119" title="must">must</em> support [<cite><a class="bibref" href="#bib-DNS-SD">DNS-SD</a></cite>] with a SRV record of the <code>webintents</code> service type.
- </p>
-
- <div class="note"><div class="note-title"><span>Note</span></div><p class="">
- A service type <code>webintents</code> should be registered in [<cite><a class="bibref" href="#bib-IANA-SRVPORT-REG">IANA-SRVPORT-REG</a></cite>].
- </p></div>
-
- <p>
- The TXT record for the <code>webintents</code> service must have following parameters:
- </p>
- <ul class="rule">
- <li>
- <code>location</code>: <em class="rfc2119" title="required">required</em>. States the location to the Web Intents document in the <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a>.
- The value of this header is path to be concatenated with a host of the <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a> to determine the location. The definition of the Web Intents document is the same as for UPnP.
- </li>
- <li>
- <code>action</code>: <em class="rfc2119" title="optional">optional</em>. If supported, states the Web Intents
- <code>action</code> of the supported Web Intents Services and <em class="rfc2119" title="must">must</em>
- match the <code>action</code> attributes of the Service registration markup in the Web Intents document. To support more than
- one Web Intents <code>action</code> the action strings <em class="rfc2119" title="must">must</em> be separated with
- comma. Commas included in action strings <em class="rfc2119" title="must">must</em> be percent-encoded as
- defined in [<cite><a class="bibref" href="#bib-RFC3986">RFC3986</a></cite>], section-2.1.
- <br>
- This allows the <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> to filter received mDNS messages so that the <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> only has to
- retrieve Web Intents documents for matching Web Intents Actions.
- </li>
- </ul>
-
- </section>
-
- </section>
- <section id="mdns-enabled-user-agent">
- <h3><span class="secno">5.2 </span>mDNS enabled User Agent</h3>
-
- <p>
- The <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> <em class="rfc2119" title="must">must</em> support discovery of <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a>s through mDNS and DNS-SD
- according to [<cite><a class="bibref" href="#bib-MDNS">MDNS</a></cite>], [<cite><a class="bibref" href="#bib-DNS-SD">DNS-SD</a></cite>] and according to the Web Intents specific DNS records defined in this specification, section 5.1.
- </p>
-
- <section class="informative" id="dynamic-service-registration">
- <h4><span class="secno">5.2.1 </span>Dynamic Service registration</h4><p><em>This section is non-normative.</em></p>
- <p>
- When the navigator.startActivity method [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] is called, the <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> typically runs the following steps:
- </p>
-
- <ol class="rule">
- <li>
- Send a multicast PTR query of the <code>_webintents._tcp.local</code> in the format specified by [<cite><a class="bibref" href="#bib-MDNS">MDNS</a></cite>] and [<cite><a class="bibref" href="#bib-DNS-SD">DNS-SD</a></cite>].
- <br>
- </li>
-
- <li>
- For each response, send a unicast TXT query of the webintents service instance in the PTR answer.
- <br>
- <p>This step can be omitted in case that the <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a> attaches a TXT answer with the previous answer.
- </p></li>
-
- <li>
- For each matching response, i.e. the response TXT record does not have an action parameter or does have an <code>action</code> parameter matching the Action of the invoked intent,
- send a unicast request with a SRV query of the webintens service instance.
- <br>
- <p>This step can be omitted in case that the <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a> attaches a SRV answer with the previous answer.
- </p></li>
-
- <li>
- For each response, send a unicast A and/or AAAA query of the host name in the SRV answer.
- <br>
- <p>This step can be omitted in case that the <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a> attaches an A and/or AAAA answer with the previous answer.
- </p></li>
-
- <li>
- The <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> attempts to retrieve the Web Intents document from the discovered <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a>.
- The destination URL consists of an IP address in the A or AAAA answer, a port number in the SRV record and an absolute path in the <code>location</code> parameter of the TXT record.
- <br> <br>
- If the <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> fails to retrieve the Web Intents document it silently disregards the received response.
- <br> <br>
- If the <code>action</code> parameter is present and does not match the <code>action</code> attributes of the Services registered in the retrieved Web Intents
- document the <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> silently disregards the the received response.
- <br> <br>
- Note that following steps are identical to those of UPnP described in 4.2.
- </li>
-
- <li>
- It is expected that the Web Intents document contains registration markup and the <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> interprets this
- registration markup according to the rules for registration defined by [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] and register the Services accordingly.
- </li>
-
- <li>
- The <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> makes each dynamically registered Service, that matches the Action of the invoked intent, available for selection
- by the user, typically by making them visible and selectable in a Web Intents Service picker.
- </li>
-
- <li>
- Based on user selection of a dynamically registered Service the <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> loads the
- Service handler code as defined by the <code>href</code> attribute in the registration markup for this Service according to the rules for
- loading Service pages defined in [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>].
- </li>
-
- </ol>
-
- </section>
-
- </section>
- <section class="informative" id="sample-records">
- <h3><span class="secno">5.3 </span>Sample Records</h3><p><em>This section is non-normative.</em></p>
-
- <p>
- See below for the example records for Web Intents. An <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> looking for devices supporting http://webintents.org/view Web Intents can understand that
- it is possible to get a Web Intents document for "LivingRoomTV" at http://192.168.1.47:3619/webintents.html.
- </p>
-
- <ul class="rule">
- <li>
- <code>_webintents._tcp.local. 120 IN PTR LivingRoomTV._webintents._tcp.local.</code>: A LivingRoomTV instance serves webintents service.
- </li>
- <li>
- <code>LivingRoomTV._webintents._tcp.local. 120 IN SRV 0 0 3619 TV40EX-W2000.local.</code>: A host "TV40EX-W2000" in the link local network offers the LivingRoomTV webintents service instance in its port 3619.
- </li>
- <li>
- <code>LivingRoomTV._webintents._tcp.local. 120 IN TXT location=/webintents.html action=http://webintents.org/view</code>: It offers http://webintents.org/view type of Web Intents. The absolute path for its Web Intents document is "/webintents.html". Note that the actual binary format of the TXT record value is concatinating key-value pairs each of which is a single byte length followed by 0-255 length key=value character string as defined in [DNS-SD].
- </li>
- <li>
- <code>TV40EX-W2000 120 IN A 192.168.1.47</code>: A host "TV40EX-W2000" is on 192.168.1.47.
- </li>
- </ul>
-
- </section>
-
- </section>
-
-
- <section class="informative" id="apis-protocols-client---service">
- <!--OddPage--><h2><span class="secno">6. </span>APIs / protocols Client - Service </h2><p><em>This section is non-normative.</em></p>
- <p>
- The APIs / protocols for interaction between Client and Service pages are not defined by this specification. It is assumed that Web Intents
- based APIs and protocols will be standardized by <abbr title="World Wide Web Consortium">W3C</abbr> and that these will be applicable for Client and Service applications running on User Agents that
- comply to this specification. Different use cases will require different ways of interaction patterns between Client and Service.
- </p>
-
- <p>
- Examples:
- </p>
- <ul class="rule">
- <li>
- A Client application invoking a "View" intent provides, as intent payload data, a link to a video to be displayed at the remote <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a>.
- The Service application takes full control of the video playback by providing control buttons and sends UPnP commands to the remote device.
- So in this case there the simple "API" just gives the link to the video to play.
- </li>
- <li>
- Some use cases require a longer lasting relation between the Client and Service applications. By using the MessagePort[] attribute of the intent object
- a message channel can be established between the Client and Service page. This message channel can be used to run Service specific protocols,
- for example a protocol that allows the Client application to send simple video playback control commands to a Service application.
- </li>
- </ul>
-
- </section>
-
- <section class="informative appendix" id="examples-and-scenarios">
- <!--OddPage--><h2><span class="secno">A. </span>Examples and scenarios</h2><p><em>This section is non-normative.</em></p>
- <section id="view-and-control-video-on-remote-device-through-service-page-control-buttons">
- <h3><span class="secno">A.1 </span>View and control video on remote device through Service page control buttons</h3><p><em>This section is non-normative.</em></p>
- <p>
- The following scenario describes how a Client page uses Web Intents to discover a remote video view service. The Service page
- contains the UI for controlling the video playback.
- </p>
-
- <p><img src="Example_scenario_1/Slide1.png" alt="Example scenario 1/Slide1" width="700" height="700"><br>
- (<a href="Example_scenario_1/Slide1.png">View as PNG</a>)
- </p>
-
- <p><img src="Example_scenario_1/Slide2.png" alt="Example scenario 1/Slide2" width="700" height="700"><br>
- (<a href="Example_scenario_1/Slide2.png">View as PNG</a>)
- </p>
-
- <p><img src="Example_scenario_1/Slide3.png" alt="Example scenario 1/Slide3" width="700" height="700"><br>
- (<a href="Example_scenario_1/Slide3.png">View as PNG</a>)
- </p>
- </section>
-
- <section id="view-and-control-video-on-remote-device-through-client-page-control-buttons">
- <h3><span class="secno">A.2 </span>View and control video on remote device through Client page control buttons</h3>
- <p>
- The following scenario describes how a Client page uses Web Intents to discover a remote video view service. The UI stays in the Client page,
- which contains the UI controls for the video playback. This means that there is a need for continuous communication between the Client page and the Service page,
- which is "hidden", i.e. it has no UI. The Client page creates a messaging channel and sends the messaging channel port to the Service page trhrough the intent invocation.
- A high level "TV control" protocol, supporting commands such as "play", "pause" and "stop, runs on top of the messaging channel.
- </p>
- <p>
- In this example the assumption is that he Client invokes an intent to discover a Service that supports a specified protocol running on top of the message channel So the
- "discover" intent Action is used and Type is set to the specific protocol used to communicate with the Service.
- </p>
-
- <div class="issue"><div class="issue-title"><span>Issue 1</span></div><p class="">
- This scenario assumes the possibility to have hidden/background Service pages or Service pages that are visible inline the Client page.
- Currently [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] does not allow this but <abbr title="World Wide Web Consortium">W3C</abbr> DAP Action http://www.w3.org/2009/dap/track/actions/519 should add a proposal for a hidden disposition.
- </p></div>
-
- <p><img src="Example_scenario_2/Slide1.png" alt="Example scenario 2/Slide1" width="700" height="700"><br>
- (<a href="Example_scenario_2/Slide1.png">View as PNG</a>)
- </p>
-
- <p><img src="Example_scenario_2/Slide2.png" alt="Example scenario 2/Slide2" width="700" height="700"><br>
- (<a href="Example_scenario_2/Slide2.png">View as PNG</a>)
- </p>
-
- <p><img src="Example_scenario_2/Slide3.png" alt="Example scenario 2/Slide3" width="700" height="700"><br>
- (<a href="Example_scenario_2/Slide3.png">View as PNG</a>)
- </p>
-
- <p><img src="Example_scenario_2/Slide4.png" alt="Example scenario 2/Slide4" width="700" height="700"><br>
- (<a href="Example_scenario_2/Slide4.png">View as PNG</a>)
- </p>
- </section>
-
-
-
- <section id="example-of-web-intents-document">
- <h3><span class="secno">A.3 </span>Example of Web Intents document</h3>
-
- <p><img src="Example1_registration_page/Slide1.png" alt="Example1 registration page" width="280" height="280"><br>
- (<a href="Example1_registration_page/Slide1.png">View as PNG</a>)
- </p>
- </section>
-
- <section id="example-of-upnp-device-description-document">
- <h3><span class="secno">A.4 </span>Example of UPnP Device description document</h3>
- <p><img src="Example_device_and_service_description_pages/Slide1.png" alt="Example device and service description pages/Slide1" width="600" height="600"><br>
- (<a href="Example_device_and_service_description_pages/Slide1.png">View as PNG</a>)
- </p>
- </section>
-
- </section>
-
- <section class="appendix" id="acknowledgements">
- <!--OddPage--><h2><span class="secno">B. </span>Acknowledgements</h2>
- <p>
- Many thanks to Sony colleagues Anders Isberg, Naoyuki Sato, Tatsuya Igarashi, Anders Edenbrandt and Björn Ekberg for all support.
- <br> <br>
- Many thanks to Robin Berjon for making our lives so much easier with his cool specification editing tool.
- </p>
- </section>
-
-<section id="references" class="appendix"><!--OddPage--><h2><span class="secno">C. </span>References</h2><section id="normative-references"><h3><span class="secno">C.1 </span>Normative references</h3><dl class="bibliography"><dt id="bib-DNS-SD">[DNS-SD]</dt><dd>S. Cheshire; M. Krochmal. <a href="http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt"><cite>DNS-Based Service Discovery.</cite></a> 27 February 2011. IETF Draft. URL: <a href="http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt">http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt</a>
-</dd><dt id="bib-IANA-SRVPORT-REG">[IANA-SRVPORT-REG]</dt><dd><a href="http://www.iana.org/form/ports-services">IANA Service Name and Transport Protocol Port Number Registry</a>. URL: <a href="http://www.iana.org/form/ports-services">http://www.iana.org/form/ports-services</a>
-</dd><dt id="bib-MDNS">[MDNS]</dt><dd>S. Cheshire; M. Krochmal. <a href="http://files.multicastdns.org/draft-cheshire-dnsext-multicastdns.txt"><cite>Multicast DNS.</cite></a> 14 February 2011. IETF Draft. URL: <a href="http://files.multicastdns.org/draft-cheshire-dnsext-multicastdns.txt">http://files.multicastdns.org/draft-cheshire-dnsext-multicastdns.txt</a>
-</dd><dt id="bib-RFC2119">[RFC2119]</dt><dd>S. Bradner. <a href="http://www.ietf.org/rfc/rfc2119.txt"><cite>Key words for use in RFCs to Indicate Requirement Levels.</cite></a> March 1997. Internet RFC 2119. URL: <a href="http://www.ietf.org/rfc/rfc2119.txt">http://www.ietf.org/rfc/rfc2119.txt</a>
-</dd><dt id="bib-RFC3986">[RFC3986]</dt><dd>T. Berners-Lee; R. Fielding; L. Masinter. <a href="http://www.ietf.org/rfc/rfc3986.txt"><cite>Uniform Resource Identifier (URI): Generic Syntax.</cite></a> January 2005. Internet RFC 3986. URL: <a href="http://www.ietf.org/rfc/rfc3986.txt">http://www.ietf.org/rfc/rfc3986.txt</a>
-</dd><dt id="bib-UPNP-DEVICEARCH">[UPNP-DEVICEARCH]</dt><dd><a href="http://www.upnp.org/specs/arch/UPnP-arch-DeviceArchitecture-v1.0-20081015.pdf"><cite>UPnP Device Architecture 1.0</cite></a>. 15 October 2008. UPnP Forum. For UPnP Version 1.0. PDF document. URL: <a href="http://www.upnp.org/specs/arch/UPnP-arch-DeviceArchitecture-v1.0-20081015.pdf">http://www.upnp.org/specs/arch/UPnP-arch-DeviceArchitecture-v1.0-20081015.pdf</a>
-</dd><dt id="bib-WEBIDL">[WEBIDL]</dt><dd>Cameron McCormack. <a href="http://www.w3.org/TR/2011/WD-WebIDL-20110927/"><cite>Web IDL.</cite></a> 27 September 2011. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2011/WD-WebIDL-20110927/">http://www.w3.org/TR/2011/WD-WebIDL-20110927/</a>
-</dd><dt id="bib-WEBINTENTS">[WEBINTENTS]</dt><dd>Greg Billock; James Hawkins; Paul Kinlan. <a href="http://dvcs.w3.org/hg/web-intents/raw-file/tip/spec/Overview.html"><cite>Web Intents.</cite></a> Editors' Draft. (Work in progress.) URL: <a href="http://dvcs.w3.org/hg/web-intents/raw-file/tip/spec/Overview.html">http://dvcs.w3.org/hg/web-intents/raw-file/tip/spec/Overview.html</a>
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+ <p>
+
+ <a href="http://www.w3.org/"><img width="72" height="48" src="http://www.w3.org/Icons/w3c_home" alt="W3C"></a>
+
+ </p>
+ <h1 class="title" id="title">Web Intents Addendum - Local Services</h1>
+
+ <h2 id="w3c-working-draft-27-september-2012"><abbr title="World Wide Web Consortium">W3C</abbr> Working Draft 27 September 2012</h2>
+ <dl>
+
+ <dt>This version:</dt>
+ <dd><a href="http://www.w3.org/TR/2012/WD-webintents-local-services-20120927/">http://www.w3.org/TR/2012/WD-webintents-local-services-20120927/</a></dd>
+ <dt>Latest published version:</dt>
+ <dd><a href="http://www.w3.org/TR/webintents-local-services/">http://www.w3.org/TR/webintents-local-services/</a></dd>
+
+
+ <dt>Latest editor's draft:</dt>
+ <dd><a href="http://w3c-test.org/dap/wi-addendum-local-services/">http://w3c-test.org/dap/wi-addendum-local-services/</a></dd>
+
+
+
+
+
+
+ <dt>Editors:</dt>
+ <dd><span>Claes Nilsson</span>, <a href="http://www.sonymobile.com/se/">Sony Mobile</a></dd>
+<dd><span>Norifumi Kikkawa</span>, <a href="http://www.sony.net/">Sony Corporation</a></dd>
+
+
+ </dl>
+
+
+
+
+
+ <p class="copyright">
+ <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> ©
+ 2012
+
+ <a href="http://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup>
+ (<a href="http://www.csail.mit.edu/"><abbr title="Massachusetts Institute of Technology">MIT</abbr></a>,
+ <a href="http://www.ercim.eu/"><abbr title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>,
+ <a href="http://www.keio.ac.jp/">Keio</a>), All Rights Reserved.
+ <abbr title="World Wide Web Consortium">W3C</abbr> <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>,
+ <a href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and
+ <a href="http://www.w3.org/Consortium/Legal/copyright-documents">document use</a> rules apply.
+ </p>
+
+
+ <hr>
+</div>
+ <section id="abstract" class="introductory"><h2>Abstract</h2><p>
+ This specification is an addendum to Web Intents, [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>], that defines how Web Intents enabled User Agents can discover and communicate
+ with local Web Intents Services.
+ </p></section><section id="sotd" class="introductory"><h2>Status of This Document</h2>
+
+
+
+ <p>
+ <em>This section describes the status of this document at the time of its publication. Other
+ documents may supersede this document. A list of current <abbr title="World Wide Web Consortium">W3C</abbr> publications and the latest revision
+ of this technical report can be found in the <a href="http://www.w3.org/TR/"><abbr title="World Wide Web Consortium">W3C</abbr> technical reports
+ index</a> at http://www.w3.org/TR/.</em>
+ </p>
+
+ <p>
+ This document was published by the <a href="http://www.w3.org/2009/dap/">DAP/Web Apps Web Intents task force</a> as a First Public Working Draft.
+
+ This document is intended to become a <abbr title="World Wide Web Consortium">W3C</abbr> Recommendation.
+
+ If you wish to make comments regarding this document, please send them to
+ <a href="mailto:public-web-intents@w3.org">public-web-intents@w3.org</a>
+ (<a href="mailto:public-web-intents-request@w3.org?subject=subscribe">subscribe</a>,
+ <a href="http://lists.w3.org/Archives/Public/public-web-intents/">archives</a>).
+
+
+ All feedback is welcome.
+ </p>
+
+ <p>
+ Publication as a Working Draft does not imply endorsement by the <abbr title="World Wide Web Consortium">W3C</abbr> Membership.
+ This is a draft document and may be updated, replaced or obsoleted by other documents at
+ any time. It is inappropriate to cite this document as other than work in progress.
+ </p>
+
+
+ <p>
+
+ This document was produced by a group operating under the
+ <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004 <abbr title="World Wide Web Consortium">W3C</abbr> Patent Policy</a>.
+
+
+
+
+ <abbr title="World Wide Web Consortium">W3C</abbr> maintains a <a href="" rel="disclosure">public list of any patent disclosures</a>
+
+ made in connection with the deliverables of the group; that page also includes instructions for
+ disclosing a patent. An individual who has actual knowledge of a patent which the individual believes contains
+ <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential Claim(s)</a> must disclose the
+ information in accordance with <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section
+ 6 of the <abbr title="World Wide Web Consortium">W3C</abbr> Patent Policy</a>.
+
+
+ </p>
+
+
+
+
+</section><section id="toc"><h2 class="introductory">Table of Contents</h2><ul class="toc"><li class="tocline"><a href="#introduction" class="tocxref"><span class="secno">1. </span>Introduction</a></li><li class="tocline"><a href="#conformance" class="tocxref"><span class="secno">2. </span>Conformance</a><ul class="toc"><li class="tocline"><a href="#dependencies" class="tocxref"><span class="secno">2.1 </span>Dependencies</a></li></ul></li><li class="tocline"><a href="#terminology" class="tocxref"><span class="secno">3. </span>Terminology</a><ul class="toc"><li class="tocline"><a href="#upnp-related-terms" class="tocxref"><span class="secno">3.1 </span>UPnP related terms</a></li><li class="tocline"><a href="#mdns-related-terms" class="tocxref"><span class="secno">3.2 </span>mDNS related terms</a></li></ul></li><li class="tocline"><a href="#upnp-adaptation" class="tocxref"><span class="secno">4. </span>UPnP adaptation</a><ul class="toc"><li class="tocline"><a href="#web-intents-enabled-upnp-device" class="tcxref"><span class="secno">4.1 </span><span class="formerLink">Web Intents enabled UPnP device</span></a><ul class="toc"><li class="tocline"><a href="#upnp-web-intents-servicetype" class="tocxref"><span class="secno">4.1.1 </span>UPnP Web Intents serviceType</a></li><li class="tocline"><a href="#web-intents-specific-ssdp-headers" class="tocxref"><span class="secno">4.1.2 </span>Web Intents specific SSDP headers</a></li><li class="tocline"><a href="#web-intents-document" class="tocxref"><span class="secno">4.1.3 </span>Web Intents document</a></li><li class="tocline"><a href="#web-intents-service-pages" class="tocxref"><span class="secno">4.1.4 </span>Web Intents Service pages</a></li></ul></li><li class="tocline"><a href="#upnp-enabled-user-agent" class="tocxref"><span class="secno">4.2 </span><span class="formerLink">UPnP enabled User Agent</span></a><ul class="toc"><li class="tocline"><a href="#dynamic-service-registration-based-on-m-search" class="tocxref"><span class="secno">4.2.1 </span>Dynamic Serviceregistration based on M-SEARCH</a></li><li class="tocline"><a href="#dynamic-service-registration-based-on-notify" class="tocxref"><span class="secno">4.2.2 </span>Dynamic Service registration based on NOTIFY</a></li><li class="tocline"><a href="#support-for-web-intents-and-upnp" class="tocxref"><span class="secno">4.2.3 </span>Support for Web Intents and UPnP</a></li><li class="tocline"><a href="#service-availability-management" class="tocxref"><span class="secno">4.2.4 </span>Service availability management</a></li></ul></li></ul></li><li class="tocline"><a href="#mdns-dns-sd-adaptation" class="tocxref"><span class="secno">5. </span>mDNS (DNS-SD) adaptation</a><ul class="toc"><li class="tocline"><a href="#web-intents-enabled-mdns-device" class="tocxref"><span class="secno">5.1 </span>Web Intents enabled mDNS device</a><ul class="toc"><li class="tocline"><a href="#web-intents-service-type-for-dns-sd" class="tocxref"><span class="secno">5.1.1 </span>Web Intents service type for DNS-SD</a></li></ul></li><li lass="tocline"><a href="#mdns-enabled-user-agent" class="tocxref"><span class="secno">5.2 </span>mDNS enabled User Agent</a><ul class="toc"><li class="tocline"><a href="#dynamic-service-registration" class="tocxref"><span class="secno">5.2.1 </span>Dynamic Service registration</a></li></ul></li><li class="tocline"><a href="#sample-records" class="tocxref"><span class="secno">5.3 </span>Sample Records</a></li></ul></li><li class="tocline"><a href="#apis-protocols-client---service" class="tocxref"><span class="secno">6. </span>APIs / protocols Client - Service </a></li><li class="tocline"><a href="#examples-and-scenarios" class="tocxref"><span class="secno">A. </span>Examples and scenarios</a><ul class="toc"><li class="tocline"><a href="#view-and-control-video-on-remote-device-through-service-page-control-buttons" class="tocxref"><span class="secno">A.1 </span>View and control video on remote device through Service page control buttons</a></li><li class="tocline"><a href="#view-and-control-video-on-remote-devce-through-client-page-control-buttons" class="tocxref"><span class="secno">A.2 </span>View and control video on remote device through Client page control buttons</a></li><li class="tocline"><a href="#example-of-web-intents-document" class="tocxref"><span class="secno">A.3 </span>Example of Web Intents document</a></li><li class="tocline"><a href="#example-of-upnp-device-description-document" class="tocxref"><span class="secno">A.4 </span>Example of UPnP Device description document</a></li></ul></li><li class="tocline"><a href="#acknowledgements" class="tocxref"><span class="secno">B. </span>Acknowledgements</a></li><li class="tocline"><a href="#references" class="tocxref"><span class="secno">C. </span>References</a><ul class="toc"><li class="tocline"><a href="#normative-references" class="tocxref"><span class="secno">C.1 </span>Normative references</a></li></ul></li></ul></section>
+
+ <section class="informative" id="introduction">
+ <!--OddPage--><h2><span class="secno">1. </span>Introduction</h2><p><em>This section is non-normative.</em></p>
+ <p>
+ Web Intents,[<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>], is a service discovery and light-weight RPC mechanism for web applications. The concept enables rich integration between web applications.
+ A typical Web Intents scenario is:
+ </p>
+ <ol class="rule">
+ <li>Web Intents Services register their intention to handle an action for the user </li>
+ <li>A web application requests to start an action (share, edit, pick, view, ...)</li>
+ <li>The user selects which service to handle the action</li>
+ <li>The selected service executes the action</li>
+ </ol>
+ <p>
+ A Web Intents Service is represented by a web page that declaratively marks itself as providing handling functionality for particular intents. Users register Web Intents Services
+ by visiting web pages that contain registration markup.
+ However, the strength of Web Intents is the ability to provide web applications with access to Services residing not only in the cloud but also in local environments.
+ </p>
+ <p>
+ This specification defines optional extensions to Web Intents enabled User Agents to discover and dynamically register local Web Intents
+ Services. Note that all details of the specific low level protocols used to discover and communicate with the local services are hidden to
+ the Client Web Applications.
+ </p>
+ <p>
+ The following code illustrates how a web application containing links to videos, can initiate video playback by creating and invoking a "video intent" as defined in [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>].
+ This code is the same irrespective of whether the Service executing the intent action is a cloud based Service or a local Service.
+ </p>
+ <div class="example"><div class="example-title"><span>Example 1</span></div><pre class="example highlight prettyprint"><span class="com">// Create a new intent</span><span class="pln">
+</span><span class="kwd">var</span><span class="pln"> intent </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">Intent</span><span class="pun">(</span><span class="pln"> </span><span class="str">"http://webintents.org/view"</span><span class="pun">,</span><span class="str">"video/mp4"</span><span class="pun">,{</span><span class="pln"> </span><span class="str">"src"</span><span class="pun">:</span><span class="pln">videoCanvas</span><span class="pun">.</span><span class="pln">src</span><span class="pun">,</span><span class="pln"> </span><span class="str">"img"</span><span class="pun">:</span><span class="pln"> videoCanvas</span><span class="pun">.</span><span class="pln">poster</span><span class="pun">});</span><span class="pln">
+
+</span><span class="com">// Start intents picker </span><span class="pln">
+navigator</span><span class="pun">.</span><span class="pln">startActivity</span><span class="pun">(</span><span class="pln">intent</span><span class="pun">,</span><span class="pln">
+ </span><span class="com">// On Result</span><span class="pln">
+ </span><span class="kwd">function</span><span class="pun">(</span><span class="pln">intentData</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">console</span><span class="pun">.</span><span class="pln">log</span><span class="pun">(</span><span class="str">"player.html: On Result"</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> intentData</span><span class="pun">);},</span><span class="pln">
+ </span><span class="com">// On Failure</span><span class="pln">
+ </span><span class="kwd">function</span><span class="pun">(</span><span class="pln">intentData</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">console</span><span class="pun">.</span><span class="pln">log</span><span class="pun">(</span><span class="str">"player.html: On Failure"</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> intentData</span><span class="pun">);});</span></pre></div>
+ <p>
+ The example below briefly describes the steps taken when a Service on a local network, e.g. UPnP or mDNS, device is discovered and selected by
+ the user.
+ </p>
+
+ <ol class="rule">
+ <li>Triggered by navigator.startActivity the User Agent will start local network discovery of Web Intents Services.</li>
+ <li>Replies from Web Intents enabled devices contain a URL to a Web Intents document, containing Web Intents Service registration
+ markup, in the device. </li>
+ <li>The Web Intents documents are retrieved by the User Agent and the dynamically registered Services are visible in the Web Intents Service picker. </li>
+ <li>User selects Service.</li>
+ <li>User Agent retrieves the Service page from the the Web Intents local network device and invokes it. </li>
+ <li>The Service page handles the intent. </li>
+ <li>When handling the intent is finished, the Service page issues window.intent.postResult and closes itself. </li>
+ </ol>
+
+ </section>
+
+ <section id="conformance"><!--OddPage--><h2><span class="secno">2. </span>Conformance</h2>
+<p>
+ As well as sections marked as non-normative, all authoring guidelines, diagrams, examples,
+ and notes in this specification are non-normative. Everything else in this specification is
+ normative.
+</p>
+<p>
+ The key words <em class="rfc2119" title="must">must</em>, <em class="rfc2119" title="must not">must not</em>, <em class="rfc2119" title="required">required</em>, <em class="rfc2119" title="should">should</em>, <em class="rfc2119" title="should not">should not</em>, <em class="rfc2119" title="recommended">recommended</em>, <em class="rfc2119" title="may">may</em>,
+ and <em class="rfc2119" title="optional">optional</em> in this specification are to be interpreted as described in [<cite><a class="bibref" href="#bib-RFC2119">RFC2119</a></cite>].
+</p>
+
+ <p>
+ This specification defines conformance criteria that apply to:
+ </p>
+ <ul class="rule">
+ <li><dfn id="dfn-upnp-enabled-user-agent">UPnP enabled User Agent</dfn>: A <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> <em class="rfc2119" title="must">must</em> support Web Intents [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] and the conformance criteria
+ stated in this specification. </li>
+ <li><dfn id="dfn-web-intents-enabled-upnp-device">Web Intents enabled UPnP device</dfn>: A <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> <em class="rfc2119" title="must">must</em> support [<cite><a class="bibref" href="#bib-UPNP-DEVICEARCH">UPNP-DEVICEARCH</a></cite>] and the conformance criteria
+ stated in this specification. </li>
+ <li><dfn id="dfn-mdns-enabled-user-agent">mDNS enabled User Agent</dfn>: An <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> <em class="rfc2119" title="must">must</em> support Web Intents [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] and the conformance criteria
+ stated in this specification. </li>
+ <li><dfn id="dfn-web-intents-enabled-mdns-device">Web Intents enabled mDNS device</dfn>: A <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a> <em class="rfc2119" title="must">must</em> support [<cite><a class="bibref" href="#bib-DNS-SD">DNS-SD</a></cite>], [<cite><a class="bibref" href="#bib-MDNS">MDNS</a></cite>] and the conformance criteria
+ stated in this specification. </li>
+ </ul>
+
+ <p>
+ Implementations that use ECMAScript to implement the APIs defined in
+ this specification must implement them in a manner consistent with the
+ ECMAScript Bindings defined in the Web IDL specification [<cite><a class="bibref" href="#bib-WEBIDL">WEBIDL</a></cite>],
+ as this specification uses that specification and terminology.
+ </p>
+ <section id="dependencies">
+ <h3><span class="secno">2.1 </span>Dependencies</h3>
+ <p>
+ This specification relies on the following specifications:
+ </p>
+
+ <dl>
+ <dt>Web Intents</dt>
+ <dd>This addendum specification is dependent on and defines optional extensions to the basic Web Intents specification, [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>]. </dd>
+ <dt>UPnP Device Architecture 1.0</dt>
+ <dd>This addendum specification is dependent on and defines vendor specific extensions to the UPnP Device Architecture 1.0 specification, [<cite><a class="bibref" href="#bib-UPNP-DEVICEARCH">UPNP-DEVICEARCH</a></cite>]. </dd>
+ <dt>IANA Service Name and Transport Protocol Port Number Registry</dt>
+ <dd>This addendum specification adds new entry on it, [<cite><a class="bibref" href="#bib-IANA-SRVPORT-REG">IANA-SRVPORT-REG</a></cite>]. </dd>
+ <dt>DNS-SD</dt>
+ <dd>This addendum specification is dependent on it, [<cite><a class="bibref" href="#bib-DNS-SD">DNS-SD</a></cite>]. </dd>
+ <dt>mDNS</dt>
+ <dd>This addendum specification is dependent on it, [<cite><a class="bibref" href="#bib-MDNS">MDNS</a></cite>]. </dd>
+ </dl>
+
+
+ </section>
+ </section>
+
+ <section id="terminology">
+ <!--OddPage--><h2><span class="secno">3. </span>Terminology</h2>
+ <p>
+ Web Intents related terms are used according to section "Terminology" in [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>].
+ </p>
+
+ <section id="upnp-related-terms">
+ <h3><span class="secno">3.1 </span>UPnP related terms</h3>
+ <p>
+ UPnP related terms are used according to [<cite><a class="bibref" href="#bib-UPNP-DEVICEARCH">UPNP-DEVICEARCH</a></cite>].
+ </p>
+ <p>
+ The <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> has the role of a <dfn id="dfn-control-point">control point</dfn> according to UPnP terminology.
+ </p>
+ <p>
+ The <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> discovered by the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> has the roles of <dfn id="dfn-device">device</dfn> according to UPnP terminology.
+ </p>
+ </section>
+
+ <section id="mdns-related-terms">
+ <h3><span class="secno">3.2 </span>mDNS related terms</h3>
+ <p>
+ The <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> has the role of a <dfn id="dfn-DNS-client">DNS client</dfn> with capability of [<cite><a class="bibref" href="#bib-DNS-SD">DNS-SD</a></cite>].
+ </p>
+ <p>
+ The <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a> discovered by the <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> has the roles of <dfn id="dfn-service">service</dfn> according to [<cite><a class="bibref" href="#bib-MDNS">MDNS</a></cite>] and [<cite><a class="bibref" href="#bib-DNS-SD">DNS-SD</a></cite>].
+ </p>
+ </section>
+
+
+ </section>
+
+ <section id="upnp-adaptation">
+
+ <!--OddPage--><h2><span class="secno">4. </span>UPnP adaptation</h2>
+
+ <section id="web-intents-enabled-upnp-device">
+
+ <h3><span class="secno">4.1 </span><a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a></h3>
+
+ <p>
+ The <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> <em class="rfc2119" title="must">must</em> support this section.
+ </p>
+
+ <section id="upnp-web-intents-servicetype">
+
+ <h4><span class="secno">4.1.1 </span>UPnP Web Intents serviceType</h4>
+
+ <p>
+ The <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> <em class="rfc2119" title="must">must</em> support one UPnP service which serviceType is the <code>urn:schemas-webintents-org:service:WebIntents:1</code>
+ as a vendor specific serviceType according to [<cite><a class="bibref" href="#bib-UPNP-DEVICEARCH">UPNP-DEVICEARCH</a></cite>]. It is vendor dependent how the <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> implements the serviceType,
+ i.e. a device description of any deviceType could include this serviceType.
+ </p>
+
+ <p>
+ The Web Intents serviceType <em class="rfc2119" title="must">must</em> have a dummy state variable, <code>X_State</code> of <code>boolean</code> data type to comform to [<cite><a class="bibref" href="#bib-UPNP-DEVICEARCH">UPNP-DEVICEARCH</a></cite>]
+ which requires one or more state variables in a serviceType. The <code>X_State</code> state variable is not used with a value and is never evented.
+ </p>
+ <p>
+ The Web Intents serviceType has no standard action.
+ </p>
+
+ <p>
+ See below for the UPnP Service description document of the Web Intents serviceType.
+ </p>
+
+ <p><img src="Example_device_and_service_description_pages/Slide2.png" alt="Service description page" width="600" height="600"><br>
+ (<a href="Example_device_and_service_description_pages/Slide2.png">View as PNG</a>)
+ </p>
+
+
+ </section>
+
+ <section id="web-intents-specific-ssdp-headers">
+
+ <h4><span class="secno">4.1.2 </span>Web Intents specific SSDP headers</h4>
+
+ <p>
+ The <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> <em class="rfc2119" title="must">must</em> support SSDP discovery process based on standard UPnP Discovery extended with 2 additional
+ SSDP headers for M-SEARCH response and NOTIFY when ST/NT headers are:<code>urn:schemas-webintents-org:service:WebIntents:1</code>
+ </p>
+
+ <ul class="rule">
+ <li>
+ <code>location.webintents.org</code>: <em class="rfc2119" title="required">required</em>. States the location to the Web Intents document in the <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a>.
+ If the value of this header is a relative URL the base URL is the base URL of the <code>LOCATION</code> header.
+ </li>
+ <li>
+ <code>action.webintents.org</code>: <em class="rfc2119" title="optional">optional</em>. If supported, states the Web Intents
+ <code>action</code> of the supported Web Intents Services and <em class="rfc2119" title="must">must</em>
+ match the <code>action</code> attributes of the Service registration markup in the Web Intents document. To support more than
+ one Web Intents <code>action</code> the action strings <em class="rfc2119" title="must">must</em> be separated with
+ comma. Commas included in action strings <em class="rfc2119" title="must">must</em> be percent-encoded as
+ defined in [<cite><a class="bibref" href="#bib-RFC3986">RFC3986</a></cite>], section-2.1.
+ <br>
+ This header allows the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> to filter received SSDP messages so that the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> only has to
+ retrieve Web Intents documents for matching Web Intents Actions.
+ </li>
+ </ul>
+
+ </section>
+
+ <section id="web-intents-document">
+
+ <h4><span class="secno">4.1.3 </span>Web Intents document</h4>
+
+ <p>
+ The <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> <em class="rfc2119" title="must">must</em> host Web Intents documents for the Web Intents Services the <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> supports.
+ Web Intents documents are html pages that contain Web Intents Service registration markup according to the rules for Web Intents Service registration defined
+ by [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>]. They may also contain Service handler code for Services registered within the same document.
+ </p>
+
+ </section>
+
+ <section id="web-intents-service-pages">
+
+ <h4><span class="secno">4.1.4 </span>Web Intents Service pages</h4>
+
+ <p>
+ The <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> <em class="rfc2119" title="must">must</em> host a Web Intents Service page for each Service that is
+ referred in Web Intents documents through <code>href</code> attributes in the registration markup.
+ </p>
+ <p>
+ Service pages contain Service handler code and fulfills the rules for Web Intents Services as defined by [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>].
+ </p>
+
+ </section>
+
+ </section>
+
+ <section id="upnp-enabled-user-agent">
+
+ <h3><span class="secno">4.2 </span><a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a></h3>
+
+ <p>
+ The <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> <em class="rfc2119" title="must">must</em> support discovery of <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a>s through SSDP Discovery or through Advertisement
+ or through both methods according to [<cite><a class="bibref" href="#bib-UPNP-DEVICEARCH">UPNP-DEVICEARCH</a></cite>] and according to the Web Intents serviceType and Web Intents specific SSDP headers
+ defined in this specification, section 4.1.
+ </p>
+
+ <p>
+ The sections below describe typical steps using these methods.
+ </p>
+
+ <section class="informative" id="dynamic-service-registration-based-on-m-search">
+ <h4><span class="secno">4.2.1 </span>Dynamic Service registration based on M-SEARCH</h4><p><em>This section is non-normative.</em></p>
+
+ <p>
+ The section describes the discovery process based on standard UPnP M-SEARCH multicast request.
+ </p>
+
+ <p>
+ When the navigator.startActivity method [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] is called, the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> runs the following steps:
+ </p>
+
+ <ol class="rule">
+ <li>
+ Send a multicast request with the method M-SEARCH in the format specified by [<cite><a class="bibref" href="#bib-UPNP-DEVICEARCH">UPNP-DEVICEARCH</a></cite>].
+ <br>
+ The <code>ST</code> header is set to: <code>urn:schemas-webintents-org:service:WebIntents:1</code>
+ </li>
+
+ <li>
+ For each matching M-SEARCH response, i.e. the response ST header is <code>urn:schemas-webintents-org:service:WebIntents:1</code> and the <code>action.webintents.org</code>
+ header, if present, matches the Action of the invoked intent,
+ the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> attempts to retrieve the Web Intents document from the discovered <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a>.
+ The value of the <code>location.webintents.org</code> header is the location for the Web Intents document.
+ If this value is a relative URL the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> uses the base URL of the <code>LOCATION</code> header as base URL for the location of the
+ Web Intents document.
+ <br> <br>
+ If the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> fails to retrieve the Web Intents document it silently disregards the received M-SEARCH response.
+ <br> <br>
+ If the <code>action.webintents.org</code> header is present and does not match the <code>action</code> attributes of the Services registered in the retrieved Web Intents
+ document the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> silently disregards the the received M-SEARCH response.
+ </li>
+
+ <li>
+ It is expected that the Web Intents document contains registration markup and the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> interprets this
+ registration markup according to the rules for registration defined by [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] and register the Services accordingly.
+ </li>
+
+ <li>
+ The <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> makes each dynamically registered Service, that matches the Action of the invoked intent, available for selection
+ by the user, typically by making them visible and selectable in a Web Intents Service picker.
+ </li>
+
+ <li>
+ Based on user selection of a dynamically registered Service the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> loads the
+ Service handler code as defined by the <code>href</code> attribute in the registration markup for this Service according to the rules for
+ loading Service pages defined in [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>].
+ </li>
+
+ </ol>
+
+ </section>
+
+ <section class="informative" id="dynamic-service-registration-based-on-notify">
+ <h4><span class="secno">4.2.2 </span>Dynamic Service registration based on NOTIFY</h4><p><em>This section is non-normative.</em></p>
+ <p>
+ This section describes the discovery process based on standard UPnP Advertisement with NOTIFY message.
+ </p>
+
+ <p>
+ The <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> <em class="rfc2119" title="may">may</em> continuously listen to and act on advertisments according to the following steps:
+ </p>
+ <ol class="rule">
+
+ <li>
+ The <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> maintains a list of announced UPnP services based on received SSDP NOTIFY messages
+ with <code>NT</code> header equal to <code>urn:schemas-webintents-org:service:WebIntents:1</code>.
+ </li>
+
+ <li>
+ When the navigator.startActivity method [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] is called the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> checks the list
+ of of announced services and attempts to retrieve the Web Intents document from the discovered <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> in the following cases:
+ <ul>
+ <li>
+ The received NOTIFY message contains an <code>action.webintents.org</code> header and this header matches the Action of the invoked intent.
+ </li>
+ <li>
+ The received NOTIFY message does not contain an <code>action.webintents.org</code> header.
+ </li>
+ </ul>
+ <br>
+ The location of the Web Intents document is the value of the <code>location.webintents.org</code> header. If this value is a relative URL the
+ base URL is the base URL of the <code>LOCATION</code> header.
+ <br> <br>
+ If the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> fails to retrieve the Web Intents document it silently disregards the received NOTIFY message.
+ <br> <br>
+ If the <code>action.webintents.org</code> header does not match the <code>action</code> attribute in the retrieved Web Intents document
+ the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> silently disregards the received NOTIFY message.
+ </li>
+
+ <li>
+ It is expected that the Web Intents document contains registration markup and the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> interprets the
+ Web Intents document according to the rules for registration defined by [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] and register the Services accordingly.
+ </li>
+
+ <li>
+ The <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> makes each dynamically registered Service, that matches the Action of the invoked intent, available for selection
+ by the user, typically by making them visible and selectable in a Web Intents Service picker.
+ </li>
+
+ <li>
+ Based on user selection of a dynamically registered Service the <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> loads the
+ Service handler code as defined by the <code>href</code> attribute in the registration markup for this Service according to the rules for
+ loading Service pages defined in [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>].
+ </li>
+ </ol>
+
+ <div class="note"><div class="note-title"><span>Note</span></div><p class="">
+ Power consumption in battery powered devices should be considered. If power consumption is severe continuously listening to SSDP advertisement in the background
+ should not be used..
+ </p></div>
+
+ </section>
+
+ <section class="informative" id="support-for-web-intents-and-upnp">
+ <h4><span class="secno">4.2.3 </span>Support for Web Intents and UPnP</h4><p><em>This section is non-normative.</em></p>
+ <p>
+ In addition to the normative statements defined in this specification a <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> that complies to this specification
+ supports Web Intents according to [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] and UPnP Discovery, Description and Control according to [<cite><a class="bibref" href="#bib-UPNP-DEVICEARCH">UPNP-DEVICEARCH</a></cite>].
+ However, it is implementation dependent whether this is supported natively in the User Agent or supported through some external component,
+ e.g. an in-device web server.
+ </p>
+ </section>
+
+ <section class="informative" id="service-availability-management">
+
+ <h4><span class="secno">4.2.4 </span>Service availability management</h4><p><em>This section is non-normative.</em></p>
+
+ <p>
+ The <a href="#dfn-upnp-enabled-user-agent" class="internalDFN">UPnP enabled User Agent</a> should manage the availability of UPnP services. For example detect when contact with a <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a> is lost through standard
+ UPnP life cycle management and remove a previously discovered and registered Service from the Service picker. However, for battery powered devices
+ power consumption should be considered and long lasting "keep alive" sessions" should be avoided.
+ </p>
+
+ </section>
+
+ </section>
+
+
+
+ </section>
+
+ <section id="mdns-dns-sd-adaptation">
+
+ <!--OddPage--><h2><span class="secno">5. </span>mDNS (DNS-SD) adaptation</h2>
+
+ <p>
+ This section describes how the User Agent handles Web Intents Services provided by local devices supporting mDNS and DNS-SD.
+ </p>
+
+ <section id="web-intents-enabled-mdns-device">
+
+ <h3><span class="secno">5.1 </span>Web Intents enabled mDNS device</h3>
+
+ <p>
+ The <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a> <em class="rfc2119" title="must">must</em> support this section.
+ </p>
+
+ <section id="web-intents-service-type-for-dns-sd">
+
+ <h4><span class="secno">5.1.1 </span>Web Intents service type for DNS-SD</h4>
+
+ <p>
+ The <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a> <em class="rfc2119" title="must">must</em> support [<cite><a class="bibref" href="#bib-DNS-SD">DNS-SD</a></cite>] with a SRV record of the <code>webintents</code> service type.
+ </p>
+
+ <div class="note"><div class="note-title"><span>Note</span></div><p class="">
+ A service type <code>webintents</code> should be registered in [<cite><a class="bibref" href="#bib-IANA-SRVPORT-REG">IANA-SRVPORT-REG</a></cite>].
+ </p></div>
+
+ <p>
+ The TXT record for the <code>webintents</code> service must have following parameters:
+ </p>
+ <ul class="rule">
+ <li>
+ <code>location</code>: <em class="rfc2119" title="required">required</em>. States the location to the Web Intents document in the <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a>.
+ The value of this header is path to be concatenated with a host of the <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a> to determine the location. The definition of the Web Intents document is the same as for UPnP.
+ </li>
+ <li>
+ <code>action</code>: <em class="rfc2119" title="optional">optional</em>. If supported, states the Web Intents
+ <code>action</code> of the supported Web Intents Services and <em class="rfc2119" title="must">must</em>
+ match the <code>action</code> attributes of the Service registration markup in the Web Intents document. To support more than
+ one Web Intents <code>action</code> the action strings <em class="rfc2119" title="must">must</em> be separated with
+ comma. Commas included in action strings <em class="rfc2119" title="must">must</em> be percent-encoded as
+ defined in [<cite><a class="bibref" href="#bib-RFC3986">RFC3986</a></cite>], section-2.1.
+ <br>
+ This allows the <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> to filter received mDNS messages so that the <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> only has to
+ retrieve Web Intents documents for matching Web Intents Actions.
+ </li>
+ </ul>
+
+ </section>
+
+ </section>
+ <section id="mdns-enabled-user-agent">
+ <h3><span class="secno">5.2 </span>mDNS enabled User Agent</h3>
+
+ <p>
+ The <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> <em class="rfc2119" title="must">must</em> support discovery of <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a>s through mDNS and DNS-SD
+ according to [<cite><a class="bibref" href="#bib-MDNS">MDNS</a></cite>], [<cite><a class="bibref" href="#bib-DNS-SD">DNS-SD</a></cite>] and according to the Web Intents specific DNS records defined in this specification, section 5.1.
+ </p>
+
+ <section class="informative" id="dynamic-service-registration">
+ <h4><span class="secno">5.2.1 </span>Dynamic Service registration</h4><p><em>This section is non-normative.</em></p>
+ <p>
+ When the navigator.startActivity method [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] is called, the <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> typically runs the following steps:
+ </p>
+
+ <ol class="rule">
+ <li>
+ Send a multicast PTR query of the <code>_webintents._tcp.local</code> in the format specified by [<cite><a class="bibref" href="#bib-MDNS">MDNS</a></cite>] and [<cite><a class="bibref" href="#bib-DNS-SD">DNS-SD</a></cite>].
+ <br>
+ </li>
+
+ <li>
+ For each response, send a unicast TXT query of the webintents service instance in the PTR answer.
+ <br>
+ <p>This step can be omitted in case that the <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a> attaches a TXT answer with the previous answer.
+ </p></li>
+
+ <li>
+ For each matching response, i.e. the response TXT record does not have an action parameter or does have an <code>action</code> parameter matching the Action of the invoked intent,
+ send a unicast request with a SRV query of the webintens service instance.
+ <br>
+ <p>This step can be omitted in case that the <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a> attaches a SRV answer with the previous answer.
+ </p></li>
+
+ <li>
+ For each response, send a unicast A and/or AAAA query of the host name in the SRV answer.
+ <br>
+ <p>This step can be omitted in case that the <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a> attaches an A and/or AAAA answer with the previous answer.
+ </p></li>
+
+ <li>
+ The <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> attempts to retrieve the Web Intents document from the discovered <a href="#dfn-web-intents-enabled-mdns-device" class="internalDFN">Web Intents enabled mDNS device</a>.
+ The destination URL consists of an IP address in the A or AAAA answer, a port number in the SRV record and an absolute path in the <code>location</code> parameter of the TXT record.
+ <br> <br>
+ If the <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> fails to retrieve the Web Intents document it silently disregards the received response.
+ <br> <br>
+ If the <code>action</code> parameter is present and does not match the <code>action</code> attributes of the Services registered in the retrieved Web Intents
+ document the <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> silently disregards the the received response.
+ <br> <br>
+ Note that following steps are identical to those of UPnP described in 4.2.
+ </li>
+
+ <li>
+ It is expected that the Web Intents document contains registration markup and the <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> interprets this
+ registration markup according to the rules for registration defined by [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] and register the Services accordingly.
+ </li>
+
+ <li>
+ The <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> makes each dynamically registered Service, that matches the Action of the invoked intent, available for selection
+ by the user, typically by making them visible and selectable in a Web Intents Service picker.
+ </li>
+
+ <li>
+ Based on user selection of a dynamically registered Service the <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> loads the
+ Service handler code as defined by the <code>href</code> attribute in the registration markup for this Service according to the rules for
+ loading Service pages defined in [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>].
+ </li>
+
+ </ol>
+
+ </section>
+
+ </section>
+ <section class="informative" id="sample-records">
+ <h3><span class="secno">5.3 </span>Sample Records</h3><p><em>This section is non-normative.</em></p>
+
+ <p>
+ See below for the example records for Web Intents. An <a href="#dfn-mdns-enabled-user-agent" class="internalDFN">mDNS enabled User Agent</a> looking for devices supporting http://webintents.org/view Web Intents can understand that
+ it is possible to get a Web Intents document for "LivingRoomTV" at http://192.168.1.47:3619/webintents.html.
+ </p>
+
+ <ul class="rule">
+ <li>
+ <code>_webintents._tcp.local. 120 IN PTR LivingRoomTV._webintents._tcp.local.</code>: A LivingRoomTV instance serves webintents service.
+ </li>
+ <li>
+ <code>LivingRoomTV._webintents._tcp.local. 120 IN SRV 0 0 3619 TV40EX-W2000.local.</code>: A host "TV40EX-W2000" in the link local network offers the LivingRoomTV webintents service instance in its port 3619.
+ </li>
+ <li>
+ <code>LivingRoomTV._webintents._tcp.local. 120 IN TXT location=/webintents.html action=http://webintents.org/view</code>: It offers http://webintents.org/view type of Web Intents. The absolute path for its Web Intents document is "/webintents.html". Note that the actual binary format of the TXT record value is concatinating key-value pairs each of which is a single byte length followed by 0-255 length key=value character string as defined in [DNS-SD].
+ </li>
+ <li>
+ <code>TV40EX-W2000 120 IN A 192.168.1.47</code>: A host "TV40EX-W2000" is on 192.168.1.47.
+ </li>
+ </ul>
+
+ </section>
+
+ </section>
+
+
+ <section class="informative" id="apis-protocols-client---service">
+ <!--OddPage--><h2><span class="secno">6. </span>APIs / protocols Client - Service </h2><p><em>This section is non-normative.</em></p>
+ <p>
+ The APIs / protocols for interaction between Client and Service pages are not defined by this specification. It is assumed that Web Intents
+ based APIs and protocols will be standardized by <abbr title="World Wide Web Consortium">W3C</abbr> and that these will be applicable for Client and Service applications running on User Agents that
+ comply to this specification. Different use cases will require different ways of interaction patterns between Client and Service.
+ </p>
+
+ <p>
+ Examples:
+ </p>
+ <ul class="rule">
+ <li>
+ A Client application invoking a "View" intent provides, as intent payload data, a link to a video to be displayed at the remote <a href="#dfn-web-intents-enabled-upnp-device" class="internalDFN">Web Intents enabled UPnP device</a>.
+ The Service application takes full control of the video playback by providing control buttons and sends UPnP commands to the remote device.
+ So in this case there the simple "API" just gives the link to the video to play.
+ </li>
+ <li>
+ Some use cases require a longer lasting relation between the Client and Service applications. By using the MessagePort[] attribute of the intent object
+ a message channel can be established between the Client and Service page. This message channel can be used to run Service specific protocols,
+ for example a protocol that allows the Client application to send simple video playback control commands to a Service application.
+ </li>
+ </ul>
+
+ </section>
+
+ <section class="informative appendix" id="examples-and-scenarios">
+ <!--OddPage--><h2><span class="secno">A. </span>Examples and scenarios</h2><p><em>This section is non-normative.</em></p>
+ <section id="view-and-control-video-on-remote-device-through-service-page-control-buttons">
+ <h3><span class="secno">A.1 </span>View and control video on remote device through Service page control buttons</h3><p><em>This section is non-normative.</em></p>
+ <p>
+ The following scenario describes how a Client page uses Web Intents to discover a remote video view service. The Service page
+ contains the UI for controlling the video playback.
+ </p>
+
+ <p><img src="Example_scenario_1/Slide1.png" alt="Example scenario 1/Slide1" width="700" height="700"><br>
+ (<a href="Example_scenario_1/Slide1.png">View as PNG</a>)
+ </p>
+
+ <p><img src="Example_scenario_1/Slide2.png" alt="Example scenario 1/Slide2" width="700" height="700"><br>
+ (<a href="Example_scenario_1/Slide2.png">View as PNG</a>)
+ </p>
+
+ <p><img src="Example_scenario_1/Slide3.png" alt="Example scenario 1/Slide3" width="700" height="700"><br>
+ (<a href="Example_scenario_1/Slide3.png">View as PNG</a>)
+ </p>
+ </section>
+
+ <section id="view-and-control-video-on-remote-device-through-client-page-control-buttons">
+ <h3><span class="secno">A.2 </span>View and control video on remote device through Client page control buttons</h3>
+ <p>
+ The following scenario describes how a Client page uses Web Intents to discover a remote video view service. The UI stays in the Client page,
+ which contains the UI controls for the video playback. This means that there is a need for continuous communication between the Client page and the Service page,
+ which is "hidden", i.e. it has no UI. The Client page creates a messaging channel and sends the messaging channel port to the Service page trhrough the intent invocation.
+ A high level "TV control" protocol, supporting commands such as "play", "pause" and "stop, runs on top of the messaging channel.
+ </p>
+ <p>
+ In this example the assumption is that he Client invokes an intent to discover a Service that supports a specified protocol running on top of the message channel So the
+ "discover" intent Action is used and Type is set to the specific protocol used to communicate with the Service.
+ </p>
+
+ <div class="issue"><div class="issue-title"><span>Issue 1</span></div><p class="">
+ This scenario assumes the possibility to have hidden/background Service pages or Service pages that are visible inline the Client page.
+ Currently [<cite><a class="bibref" href="#bib-WEBINTENTS">WEBINTENTS</a></cite>] does not allow this but <abbr title="World Wide Web Consortium">W3C</abbr> DAP Action http://www.w3.org/2009/dap/track/actions/519 should add a proposal for a hidden disposition.
+ </p></div>
+
+ <p><img src="Example_scenario_2/Slide1.png" alt="Example scenario 2/Slide1" width="700" height="700"><br>
+ (<a href="Example_scenario_2/Slide1.png">View as PNG</a>)
+ </p>
+
+ <p><img src="Example_scenario_2/Slide2.png" alt="Example scenario 2/Slide2" width="700" height="700"><br>
+ (<a href="Example_scenario_2/Slide2.png">View as PNG</a>)
+ </p>
+
+ <p><img src="Example_scenario_2/Slide3.png" alt="Example scenario 2/Slide3" width="700" height="700"><br>
+ (<a href="Example_scenario_2/Slide3.png">View as PNG</a>)
+ </p>
+
+ <p><img src="Example_scenario_2/Slide4.png" alt="Example scenario 2/Slide4" width="700" height="700"><br>
+ (<a href="Example_scenario_2/Slide4.png">View as PNG</a>)
+ </p>
+ </section>
+
+
+
+ <section id="example-of-web-intents-document">
+ <h3><span class="secno">A.3 </span>Example of Web Intents document</h3>
+
+ <p><img src="Example1_registration_page/Slide1.png" alt="Example1 registration page" width="280" height="280"><br>
+ (<a href="Example1_registration_page/Slide1.png">View as PNG</a>)
+ </p>
+ </section>
+
+ <section id="example-of-upnp-device-description-document">
+ <h3><span class="secno">A.4 </span>Example of UPnP Device description document</h3>
+ <p><img src="Example_device_and_service_description_pages/Slide1.png" alt="Example device and service description pages/Slide1" width="600" height="600"><br>
+ (<a href="Example_device_and_service_description_pages/Slide1.png">View as PNG</a>)
+ </p>
+ </section>
+
+ </section>
+
+ <section class="appendix" id="acknowledgements">
+ <!--OddPage--><h2><span class="secno">B. </span>Acknowledgements</h2>
+ <p>
+ Many thanks to Sony colleagues Anders Isberg, Naoyuki Sato, Tatsuya Igarashi, Anders Edenbrandt and Björn Ekberg for all support.
+ <br> <br>
+ Many thanks to Robin Berjon for making our lives so much easier with his cool specification editing tool.
+ </p>
+ </section>
+
+<section id="references" class="appendix"><!--OddPage--><h2><span class="secno">C. </span>References</h2><section id="normative-references"><h3><span class="secno">C.1 </span>Normative references</h3><dl class="bibliography"><dt id="bib-DNS-SD">[DNS-SD]</dt><dd>S. Cheshire; M. Krochmal. <a href="http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt"><cite>DNS-Based Service Discovery.</cite></a> 27 February 2011. IETF Draft. URL: <a href="http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt">http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt</a>
+</dd><dt id="bib-IANA-SRVPORT-REG">[IANA-SRVPORT-REG]</dt><dd><a href="http://www.iana.org/form/ports-services">IANA Service Name and Transport Protocol Port Number Registry</a>. URL: <a href="http://www.iana.org/form/ports-services">http://www.iana.org/form/ports-services</a>
+</dd><dt id="bib-MDNS">[MDNS]</dt><dd>S. Cheshire; M. Krochmal. <a href="http://files.multicastdns.org/draft-cheshire-dnsext-multicastdns.txt"><cite>Multicast DNS.</cite></a> 14 February 2011. IETF Draft. URL: <a href="http://files.multicastdns.org/draft-cheshire-dnsext-multicastdns.txt">http://files.multicastdns.org/draft-cheshire-dnsext-multicastdns.txt</a>
+</dd><dt id="bib-RFC2119">[RFC2119]</dt><dd>S. Bradner. <a href="http://www.ietf.org/rfc/rfc2119.txt"><cite>Key words for use in RFCs to Indicate Requirement Levels.</cite></a> March 1997. Internet RFC 2119. URL: <a href="http://www.ietf.org/rfc/rfc2119.txt">http://www.ietf.org/rfc/rfc2119.txt</a>
+</dd><dt id="bib-RFC3986">[RFC3986]</dt><dd>T. Berners-Lee; R. Fielding; L. Masinter. <a href="http://www.ietf.org/rfc/rfc3986.txt"><cite>Uniform Resource Identifier (URI): Generic Syntax.</cite></a> January 2005. Internet RFC 3986. URL: <a href="http://www.ietf.org/rfc/rfc3986.txt">http://www.ietf.org/rfc/rfc3986.txt</a>
+</dd><dt id="bib-UPNP-DEVICEARCH">[UPNP-DEVICEARCH]</dt><dd><a href="http://www.upnp.org/specs/arch/UPnP-arch-DeviceArchitecture-v1.0-20081015.pdf"><cite>UPnP Device Architecture 1.0</cite></a>. 15 October 2008. UPnP Forum. For UPnP Version 1.0. PDF document. URL: <a href="http://www.upnp.org/specs/arch/UPnP-arch-DeviceArchitecture-v1.0-20081015.pdf">http://www.upnp.org/specs/arch/UPnP-arch-DeviceArchitecture-v1.0-20081015.pdf</a>
+</dd><dt id="bib-WEBIDL">[WEBIDL]</dt><dd>Cameron McCormack. <a href="http://www.w3.org/TR/2011/WD-WebIDL-20110927/"><cite>Web IDL.</cite></a> 27 September 2011. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2011/WD-WebIDL-20110927/">http://www.w3.org/TR/2011/WD-WebIDL-20110927/</a>
+</dd><dt id="bib-WEBINTENTS">[WEBINTENTS]</dt><dd>Greg Billock; James Hawkins; Paul Kinlan. <a href="http://dvcs.w3.org/hg/web-intents/raw-file/tip/spec/Overview.html"><cite>Web Intents.</cite></a> Editors' Draft. (Work in progress.) URL: <a href="http://dvcs.w3.org/hg/web-intents/raw-file/tip/spec/Overview.html">http://dvcs.w3.org/hg/web-intents/raw-file/tip/spec/Overview.html</a>
</dd></dl></section></section></body></html>
\ No newline at end of file
diff -r 32487cf058c5 -r 65b5e15e8b37 wi-addendum-local-services/FPWD/FPWD_src.html
--- a/wi-addendum-local-services/FPWD/FPWD_src.html Wed Sep 26 14:47:02 2012 +0200
+++ b/wi-addendum-local-services/FPWD/FPWD_src.html Thu Sep 27 10:40:19 2012 -0400
@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!DOCTYPE html>
<html>
<head>
<title>Web Intents Addendum - Local Services</title>
@@ -15,7 +15,7 @@
specStatus: "FPWD",
// the specification's short name, as in http://www.w3.org/TR/short-name/
- shortName: "Web Intents-LD addendum",
+ shortName: "webintents-local-services",
// if your specification has a subtitle that goes below the main
// formal title, define it here
Received on Monday, 1 October 2012 18:42:08 UTC