Re: processor profile question

Simple answer: use absolute URIs when you need to do so, e.g.,

<extensions xml:base="urn:my:namespace">
   <extension restricts="http://www.w3.org/ns/ttml/feature/
#timeBase-media">#my-timebase-extension</extension>
</extensions>

On Fri, Jan 25, 2019 at 8:06 AM Nigel Megitt <nigel.megitt@bbc.co.uk> wrote:

> 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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