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LCWD comments on the DCCI specification from the Multimodal Interaction WG

From: waters Keith <keith.waters@orange-ftgroup.com>
Date: Fri, 19 Oct 2007 15:04:23 -0400
Message-Id: <ECFA11E6-44FC-422C-AD0C-4FC157B68696@orange-ftgroup.com>
Cc: Deborah Dahl <dahl@conversational-technologies.com>
To: public-dcci-editors@w3.org, w3c-mmi-wg@w3.org, member-uwa@w3c.org

Hi Debbie and Raj,

thank you for your comments [1] on the LCWD of DCCI draft 04 July 2007

What follows is a breakdown set of responses:

1. Registration for events:

1.1 Notification of Events ( Section 1.1 Uses for DCI ):

"...It also provides notifications when properties change.."

While the specification describes use of DOM3 events, given that DCCI
will have a different root-element ( namespace), it is not clear how
components that want the notifications register for the


RESPONSE: The registration for events is performed on the DCCI node,
with addEventListener() or addEventListenerNS().  The namespace of the
event itself for the dci-prop-change event is to be
http://www.w3.org/2007/dci per
http://www.w3.org/TR/DPF#event-dci-prop-change and
http://www.w3.org/TR/DPF#sec-conformance.  The changed DCCI node will
be the target of the event, and has its own namespace.  This is
unrelated to any namespace associated with the registering source.


1.2 MMI Architecture allows Interaction Manager (IM) and Modality
Components( MC) to be distributed. And except in the case of
nested-modality components, modality components communicate with each
other only through the Interaction Manager. Given this principle of
MMI architecture, MMI authors would be required under the proposed
DCCI spec, to implement another DCCI-interface component to register
and obtain the local DCI events to pass on to IM for every device on
which any modality component is running..

For example, a device-client could be getting the text-to-speech
streamed from a TTS server. Now, if the user mutes the speaker on the
device, an event gets generated on the local device through DCI, but
the IM running on the server (a different device) will not get this
event to signal the TTS-component to stop streaming audio, as it will
not have a way to remotely register and get this event from the
device. So, under the proposed specification, an MMI author would be
forced to implement another MMI component just for passing on DCI
events to the IM. Please, note that the local Modality Component
cannot directly do this job, as the local Modality Components are to
be implemented as black-boxes and as such cannot snoop on these events
and determine which ones should be passed-on to the Interaction

We would like to hear from DCI-WG on how this remote-registration for
events could be done, under the the current DCI framework.


RESPONSE: There is no facility in place for remote event registration
associated with DCCI and is therefore this is considered out-of-scope
for DCCI at this time. There is the potential that other remote event
standards could be applied to DCCI events in the future.  At that time
DCCI can review adherence to that specification.


2. Section 2.1 of DCCI specification on Interfaces :

"....DCCI is an interface that focuses on making properties from the
delivery context available to code executing within a web client

The glossary referenced above DOES NOT contain definition of
web-client, but client as described below :

Client ( www.w3.org/TR/di-gloss)
     The role adopted by an application when it is retrieving and/or
rendering resources or resource manifestations.
     This term was taken verbatim from Web Characterization Terminology
& Definitions Sheet.

Further, from MMI perspective clients needs not be web-clients (
meaning implementing HTTP protocol for communication with servers..)


RESPONSE: Thanks. There is a editorial correction to be made here. The
reference to "web client" and "web server" in section 2.1 should be
changed to "client" and "server".


Hopefully this address your concerns.  If not, please respond by Nov


-Keith Waters

[1] http://lists.w3.org/Archives/Public/public-dcci-editors/2007Aug/ 
[2] http://www.w3.org/TR/DPF/

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Received on Friday, 19 October 2007 19:08:27 UTC

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