FW: W3C TTWG Liaison to SMPTE

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From: Michael Dolan <mike@dolan.tv<mailto:mike@dolan.tv>>
Date: Thursday, 22 June 2017 at 15:17
To: Nigel Megitt <nigel.megitt@bbc.co.uk<mailto:nigel.megitt@bbc.co.uk>>
Cc: Thierry MICHEL <tmichel@w3.org<mailto:tmichel@w3.org>>, Philippe Le Hégaret <plh@w3.org<mailto:plh@w3.org>>, W3C Liaisons <team-liaisons@w3.org<mailto:team-liaisons@w3.org>>, "alan.lambshead@icloud.com<mailto:alan.lambshead@icloud.com>" <alan.lambshead@icloud.com<mailto:alan.lambshead@icloud.com>>, "liaisons@lists.smpte.org<mailto:liaisons@lists.smpte.org>" <liaisons@lists.smpte.org<mailto:liaisons@lists.smpte.org>>
Subject: RE: W3C TTWG Liaison to SMPTE

Dear Nigel,

Thank you for W3C’s continued interest in SMPTE Timed Text.

The ST2052-1:2010 schema as updated in 2012 by committee at this location: https://smpte-ra.org/schemas/2052-1/2010/smpte-tt

It includes backgroundImage.

Best regards,

                Mike
                SMPTE 24TB Chair

From: Nigel Megitt [mailto:nigel.megitt@bbc.co.uk]
Sent: Monday, June 12, 2017 5:38 AM
To: Michael Dolan <mdolan@newtbt.com<mailto:mdolan@newtbt.com>>
Cc: Thierry MICHEL <tmichel@w3.org<mailto:tmichel@w3.org>>; Philippe Le Hégaret <plh@w3.org<mailto:plh@w3.org>>; W3C Liaisons <team-liaisons@w3.org<mailto:team-liaisons@w3.org>>
Subject: W3C TTWG Liaison to SMPTE

C/O Mr. Mike Dolan, W3C Liaison contact for Timed Text activities in SMPTE, CC Philippe Le Hégaret, Thierry Michel, W3C Team contacts.


Dear Mr. Lambshead,

As you know, W3C Timed Text Working Group (TTWG) has defined an industry supported profile of “SMPTE Timed Text” called IMSC1 at [1].  This specification normatively references SMPTE ST2052-1:2010 for the image profile support for the “backgroundImage” attribute. We note that the SMPTE XML schemas for the “2010” namespace do not include a definition of this attribute. In studying 2052-1:2010 we also note that the definition of the data type for this is a bit vague. We assume it is intended to be “xs:anyURI” which we observe has been industry best practice.

TTWG has XML schemas defined for IMSC1 at [2] and we would like to supplement these schemas with a definition for backgroundImage.  Is it possible for SMPTE to enhance its ST2052-1:2010 schema to add this attribute?  Can SMPTE confirm the intent of the specification to be the datatype, “xs:anyURI”?

Another option would be for TTWG to migrate to the ST2052-1:2013 namespace, however this has been determined to be too disruptive - to industry standards that reference IMSC1, tools including validators, test materials, implementations, etc.

The TTWG would propose the following XML be used:


<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:smpte="http://www.smpte-ra.org/schemas/2052-1/2010/smpte-tt"
targetNamespace="http://www.smpte-ra.org/schemas/2052-1/2010/smpte-tt"
elementFormDefault="qualified" attributeFormDefault="qualified">
    <xs:attribute name="backgroundImage" type="xs:anyURI"/>
</xs:schema>

Alternatively, TTWG is willing to author and post the above at [2] if that’s acceptable to SMPTE.

We look forward to SMPTE’s guidance.

Kind regards,
Nigel Megitt, TTWG Chair

[1] https://www.w3.org/TR/ttml-imsc1/
[2] http://www.w3.org/TR/2016/REC-ttml-imsc1-20160421/xml-schemas/






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