processor profile question

All (but probably Glenn is best placed to answer this right now),

I'm considering making a TTML2 processor profile that adds an extension feature which imposes a restriction on #timeBase-media. This gives me a syntactic headache concerning xml:base, which is not permitted on the extension element but is permitted on its ancestor extensions element.

How do I specify that the value of @restricts is relative to the TTML namespace and the content of the extension element is relative to another (local) namespace?

If I specify:

<extensions xml:base="urn:my:namespace">
   <extension restricts="#timeBase-media">#my-timebase-extension</extension>
</extensions>

it doesn't look right because it is not clear which namespace the #timeBase-media feature is in, or it may be assumed incorrectly to be the namespace specified by the parent element's @xml:base.

kind regards,

Nigel




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