ISSUE-150: TTML XSD vallidation and extension problem

foreign-namespace

TTML XSD vallidation and extension problem

State:

CLOSED

Product:

TTML 1.0

Raised by:

Philippe Le Hégaret

Opened on:

2012-01-30

Description:

TTML allows any foreign namespace attribute on the elements, such as
http://www.w3.org/TR/ttaf1-dfxp/#document-structure-vocabulary-tt

However, the schema is constructed to reject all such attributes.

For example, the following XML would be rejected, even though it is clearly permitted by the Recommendation:
<p cff:forcedDisplayMode=”true”>translated from Klingon</p>

As a result, those working on derived schemas from TTML that add attributes to the existing elements are forced to do unusual things in their schemas to work around this and/or create schemas from scratch. And such instance documents cannot be validated against TTML since they are (wrongly) rejected.

The obvious way to correct this would be to add anyAttribute=”##other” to the element definitions, however, this would then enable false validations of non-default TT namespace elements (e.g. ttm: ), which is undesirable.

Related Actions Items:

No related actions

Related emails:

1. Re: TTML XSD vallidation and extension problem (ISSUE-150) (from glenn@skynav.com on 2012-02-10)
2. Re: TTML XSD vallidation and extension problem (ISSUE-150) (from plh@w3.org on 2012-02-09)
3. [minutes] 20120209 Timed Text Working Group (from plh@w3.org on 2012-02-09)
4. ISSUE-150 (foreign-namespace): TTML XSD vallidation and extension problem [DFXP 1.0] (from sysbot+tracker@w3.org on 2012-01-30)

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