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W3C Last Call and Media Type request for comments: XQuery and XQueryX

From: Liam Quin <liam@w3.org>
Date: Thu, 7 Apr 2005 16:01:51 -0400
To: ietf-types@iana.org
Cc: ietf-xml-mime@imc.org, public-qt-comments@w3.org
Message-ID: <20050407200151.GN1785@w3.org>

[
 Notes:
 (1) - I'm trying to follow a new procedure here.  Becasue not
 everything is in place, the documents I refer to probably don't
 have perfect wording.  The documentation on the process was released
 after the documents were frozen for Last Call, but we can make
 any needed changes for the next round of publication.  I see
 that we failed to define the correct syntax for parameters, and would
 welcome comments on any other areas wheer we need to improve.

 (2) The following text will be inserted in the next published versions
 of the documents:
    This registration is for community review and will be (or has
    been) submitted to the IESG for review, approval, and
    registration with IANA.

 (3) We are using Bugzilla to track comments on these documents;
 comments on these MIME-related pats of the documents may be made
 on the ietf-types mailing list or in Bugzilla.  See the individual
 documents and their respective "Status of this Document" sections for
 further information.

 - Liam
]

In accordance with the draft Media Type Specifications and
Registration Procedures [1], and on behalf of the W3C XML Query
Working Group [2], I hereby give notice that W3C has published
two specifications at the stage "Last Call Working Draft" which
each incorporate definitions of a standards-tree MIME media type,
as allowed for in section 3.1 of [1], and request comments on
these definitions.

The types and subtypes are
    application/xquery
	defined in "XQuery 1.0: An XML Query Language" [3]
	optional parameter: charset
    application/xquery+xml
	defined in "XML Syntax for XQuery 1.0 (XQueryX)" [4]
	optional parameter: charset


**** Registration for application/xquery also at [3]

I The application/xquery Media Type (Non-Normative)
---------------------------------------------------

This Appendix specifies the media type for XQuery Version 1.0. XQuery is
a language for querying over collections of data from XML data sources,
as specified in the main body of this document.

I.1 Introduction
----------------

This document, together with its normative references, defines the
language XQuery Version 1.0. This Appendix provides information about
the application/xquery media type, which is intended to be used for
transmitting queries written in the XQuery language.

This document was prepared by members of the W3C XML Query Working
Group. Please send comments to public-qt-comments [at] w3.org, a public
mailing list with archives at
http://lists.w3.org/Archives/Public/public-qt-comments.


I.2 Registration of MIME Media Type application/xquery
------------------------------------------------------

MIME media type name: application

MIME subtype name: xquery

Required parameters: none

Optional parameters: charset

The syntax of XQuery is expressed in Unicode but may be written with any
Unicode-compatible character encoding, including UTF-8 or UTF-16, or
transported as US-ASCII or Latin-1 with Unicode characters outside the
range of the given encoding represented using an XML-style &#xddd;
syntax.

I.2.1 Interoperability Considerations

None known.

I.2.2 Applications Using this Media Type

The public XQuery Web page lists more than two dozen implementations of
the XQuery language, both proprietary and open source.

This new media type is being registered to allow for deployment of
XQuery on the World Wide Web.

I.2.3 File Extensions

The most common file extensions in use for XQuery are .xq and .xquery.

The appropriate Macintosh file type code is TEXT.

I.2.4 Intended Usage

The intended usage of this media type is for interchange of XQuery
expressions.

I.2.5 Author/Change Controller

XQuery was produced by, and is maintained by, the World Wide Web
Consortium's XML Query Working Group. The W3C has change control over
this specification.

I.3 Encoding Considerations

For use with transports that are not 8-bit clean, quoted-printable
encoding is recommended since the XQuery syntax itself uses the
US-ASCII-compatible subset of Unicode.

An XQuery document may contain an encoding declaration as part of its
version declaration:
    xquery version "1.0" encoding "utf-8";

If an XQuery document contains an encoding declaration, it overrides the
default encoding specified by the MIME charset parameter.

I.4 Recognizing XQuery Files

An XQuery file may have the string xquery version "V.V" near the
beginning of the document, where "V.V" is a version number. Currently
the version number, if present, must be "1.0".

I.5 Charset Default Rules

XQuery documents use the Unicode character set and, by default, the
UTF-8 encoding.

I.6 Security Considerations

Queries written in XQuery may cause arbitrary URIs to be dereferenced.
Therefore, the security issues of [Uniform Resource Locators (URL)]
Section 6 should be considered. In addition, the contents of file: URIs
can in some cases be accessed, processed and returned as results.

Furthermore, because the XQuery language permits extensions, it is
possible that application/xquery may describe content that has security
implications beyond those described here.

The XML Query Working group is working on a facility to allow XQuery
expressions to be used to create and update persistent data. Untrusted
queries should not be given write access to data.


**** Registration for application/xquery+xml also at [4]

C The application/xquery+xml Media Type (Non-Normative)
-------------------------------------------------------

This Appendix specifies the media type for XQueryX Version 1.0. XQueryX
is the XML syntax of a language, XQuery, for querying over data from XML
data sources, as specified in [XQuery 1.0: An XML Query Language].

C.1 Introduction
----------------

This document, together with its normative references, defines the XML
syntax for the XML Query language XQuery Version 1.0. This Appendix
specifies the application/xquery+xml media type, which is intended to be
used for transmitting queries expressed in the XQueryX syntax.

This document was prepared by members of the W3C XML Query Working
Group. Please send comments to public-qt-comments [at] w3.org, a public
mailing list with archives at
http://lists.w3.org/Archives/Public/public-qt-comments.
C.2 Registration of MIME Media Type application/xquery+xml

MIME media type name: application

MIME subtype name: xquery+xml

Required parameters: none

Optional parameters: charset

This parameter has identical semantics to the charset parameter of the
application/xml media type as specified in [RFC3023].

C.2.1 Encoding Considerations

The considerations as specified in RFC 3023 [XMLMIME] also hold for
'application/xquery+xml'.

C.2.2 Fragment Identifiers

For documents labeled as 'application/xquery+xml', fragment identifiers
are handled as specified in RFC 3023 [XMLMIME].

C.2.3 Restrictions on usage

The intended usage of this media type is for interchange of XQueryX
expressions.

C.2.4 Security Considerations

Queries written in XQueryX may cause arbitrary URIs to be dereferenced.
Therefore, the security issues of [Uniform Resource Locators (URL)]
Section 6 should be considered. In addition, the contents of file: URIs
can in some cases be accessed, processed and returned as results.

Furthermore, because the XQuery language (and thus the XQueryX language)
permits extensions, it is possible that application/xquery+xml may
describe content that has security implications beyond those described
here. However, if the processor follows only the normative semantics of
this specification, this content will be ignored. Only in the case where
the processor recognizes and processes the additional content, or where
further processing of that content is dispatched to other processors,
would security issues arise.

The XML Query Working group is working on a facility to allow XQuery
(and thus XQueryX) expressions to be used to create and update
persistent data. Untrusted queries should not be given write access to
data.

C.2.5 Interoperability Considerations

See Section 5 ConformanceXQ.

C.2.6 Applications That Use This Media Type

The public XQuery Web page lists more than two dozen implementations of
the XQuery language, both proprietary and open source. Some of these are
known to support XQueryX.

This new media type is being registered to allow for deployment of
XQueryX on the World Wide Web.

There is no experimental, vendor specific, or personal tree predecessor
to "application/xquery+xml", reflecting the fact that no applications
currently recognize it. This new type is being registered in order to
allow for the expected deployment of XQueryX 1.0 on the World Wide Web,
as a first class XML application.

C.2.7 Additional Information

C.2.7.1 Recognizing XQuery Files ("Magic Numbers")

Although no byte sequences can be counted on to consistently identify
XQueryX, XQueryX documents will have the sequence
"http://www.w3.org/yyyy/mm/XQueryX" to identify the XQueryX namespace
(where "yyyy" is exactly four decimal digits and "mm" is exactly two
decimal digits). This sequence will normally be found in a namespace
attribute of the first element in the document.

C.2.7.2 File Extensions

The most common file extension in use for XQueryX is .xqx.

C.2.7.3 Macintosh File Type Code(s)

The appropriate Macintosh file type code is TEXT.

C.2.8 Person and Email Address to Contact For Further Information

Jim Melton, Oracle Corp., jim.melton [at] oracle.com

C.2.9 Intended Usage

COMMON

C.2.10 Author/Change Controller

XQuery was produced by, and is maintained by, the World Wide Web
Consortium's XML Query Working Group. The W3C has change control over
this specification.





[1] http://www.ietf.org/internet-drafts/draft-freed-media-type-reg-02.txt
[2] http://www.w3.org/XML/Query
[3] http://www.w3.org/TR/2005/WD-xquery-20050404/#id-mime-type
[4] http://www.w3.org/TR/2005/WD-xqueryx-20050404/#xqueryx-id-mime-type



-- 
Liam Quin, W3C XML Activity Lead, http://www.w3.org/People/Quin/
http://www.holoweb.net/~liam/
Received on Thursday, 7 April 2005 20:01:52 GMT

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