DFXP LC Comments - Issue 1 Draft Response; Anne van Kesteren

Dear Anne,

Thank you for your comments [1] on the DFXP Last Call Working Draft. The
TT WG has concluded its review of your comments and has agreed upon the
following responses.

If you require any further follow-up, then please do so no later than
September 1, and please forward your follow-up to <public-tt@w3.org>.

Regards,
Glenn Adams
Chair, Timed Text Working Group

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Citations:

[1] http://lists.w3.org/Archives/Public/public-tt/2005Mar/0031.html

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Comment - Issue #1 [1]; 21 Mar 2005 20:41:54 +0100

(1) Why isn't the specification using xml:id? 

Response:

The TT WG has reviewed the xml:id specification in considering an
answer to this question, and has concluded that the current formulation
of DFXP adequately satisfies the technical need to make reference
to element instances for which the "id" attribute is defined with type
ID. The schemas defined for DFXP specify an "id" attribute on all
element types.

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Comment - Issue #1 [1]; 21 Mar 2005 20:41:54 +0100

(2) Why is the specification using its own attribute[s] rather than
CSS? 

Response:

Other than the generic XHTML "style" attribute, CSS actually does not
support an XML based representation of style properties, unlike XSL
and SVG, both of which do support an XML representation. The TT WG has
chosen to adopt an approach closer to XSL and SVG for specifying style
information on the theory that XML transformation processors can more
easily rewrite individual XML attributes than a complex sytle
specification based upon CSS syntax.

Beyond the syntactic representation of style matter, the TT AF relies
primarily on the semantics of XSL for interpreting the formatting and
layout intentions associated with style attributes. See Section 9.3
and 9.4 for more details.

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Comment - Issue #1 [1]; 21 Mar 2005 20:41:54 +0100

(3) Why does the specification refer to CSS2, which has been revised? 

Response:

CSS2 is referenced only to refer to the display property, which is not
defined in XSL FO. CSS2.1 is not yet a REC and does not change the
definition (of "display") found in CSS2. The primary formatting and
layout semantics of TT AF are defined in terms of XSL as specified in
Sections 9.3 and 9.4.

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Comment - Issue #1 [1]; 21 Mar 2005 20:41:54 +0100

(4) Why do we need a totally new specification for this which
reinvents a lot of elements and attributes? (And CSS.) 

Response:

The TT WG was chartered to develop an XML representation of Timed
Text, including one or more document types. The TT WG has adopted
vocabulary from XHTML, CSS, XSL FO, SMIL, and SVG to satisfy the
charter.

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Comment - Issue #1 [1]; 21 Mar 2005 20:41:54 +0100

(5) Why does the specification ha[ve] so many namespaces? 

Response:

Namespaces are used to manage different uses of names within the TT
AF. This assists in avoiding name conflicts, in categorizing name
usage, and in managing future extensions.

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Comment - Issue #1 [1]; 21 Mar 2005 20:41:54 +0100

(6) I assume the namespaces will change before this specification goes
to CR? Although this is not really the "final publishing of this
specification" the specification and WG do need sufficient feedback
from implementers before they can move on to PR and beyond.

Response:

The final values of namespaces will be changed multiple times prior to
publishing REC in accordance with W3C policies regarding standardized
namespace URIs. It will change prior to CR, prior to PR, then again
prior to REC.

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Received on Friday, 12 August 2005 19:25:58 UTC