Re: ISSUE-257: Interpretation of percentage tts:fontSize on root (tt) element

 >  I'm not sure it is possible to say ##other minus {ttm,ttp,tts} 
namespaces, or at least I haven't tried doing this with XSD.

This is not possible with XML Schema 1.0. If the extensibility of TTML 
elements with "foreign namespace" attributes is implemented with the XML 
Schema  anyAttribute element, this will automatically open the door for 
potential false positive messages. Therefore documents that use 
undefined attributes  in (some) TTML namespaces will validate although 
this is not allowed.

Best regards,

Andreas

Am 17.07.2013 04:04, schrieb Glenn Adams:
>
> On Tue, Jul 16, 2013 at 6:42 PM, Michael Dolan <mdolan@newtbt.com 
> <mailto:mdolan@newtbt.com>> wrote:
>
>     Agreed. The new XML schema currently permits style attributes, and
>     should be corrected.
>
>
> This is a side effect of having added ##other to core attributes in 
> resolving ISSUE-150 [1][2].
>
> [1] http://www.w3.org/AudioVideo/TT/tracker/issues/150
> [2] 
> http://dev.w3.org/cvsweb/2008/tt/spec/xsd/Attic/ttaf1-dfxp-core-attribs.xsd.diff?r1=1.3;r2=1.4;hideattic=0;f=h
>
> I'm not sure it is possible to say ##other minus {ttm,ttp,tts} 
> namespaces, or at least I haven't tried doing this with XSD.
>
>     Unrelated, but also about the schema, I thought we had found the
>     authoritative xml.xsd on ww3.org <http://ww3.org> a while back and
>     we were going to defer to that and not include our own copy?
>
> There is a problem with the xml.xsd you refer to [3]: namely, it types 
> xml:lang as xs:language, but xs:language [4] doesn't admit the empty 
> string, which is a legal value according to XML 1.0 [5].
>
> [3] http://www.w3.org/2001/03/xml.xsd
> [4] http://www.w3.org/TR/xmlschema-2/#language
> [5] http://www.w3.org/TR/REC-xml/#sec-lang-tag
>
>     Mike
>
>     *From:*Glenn Adams [mailto:glenn@skynav.com
>     <mailto:glenn@skynav.com>]
>     *Sent:* Tuesday, July 16, 2013 4:49 PM
>     *To:* public-tt
>     *Subject:* Re: ISSUE-257: Interpretation of percentage
>     tts:fontSize on root (tt) element
>
>     I was reviewing the recently closed ISSUE-257 today, and after
>     further consideration, have determined it was incorrect, and
>     needed to be reverted which I have done in [1].
>
>     The basic problem with the previous resolution is that TT Style
>     Attributes are not defined for use on the *tt* element (with the
>     exception of the special case of tts:extent). Furthermore, the
>     outermost Content element [2] used during content style
>     inheritance is the *body* element.
>
>     Ultimately, there is no element on which tts:fontSize can be
>     specified that doesn't have a parent element. In the case of
>     *body*, if no tts:fontSize is specified, then region style
>     inheritance comes into effect. So that leaves us with a
>     tts:fontSize potentially specified on *region* as the outermost
>     inheritable font size. Accordingly, if the region's font size is
>     specified in percentage, then we do need to resolve it against
>     something other than its parent, since no ancestor of region
>     participates in style inheritance.
>
>     I will now re-implement a fix for this issue based on the need to
>     resolve percentage on region.
>
>     [1] https://dvcs.w3.org/hg/ttml/rev/0355e9473d7e
>
>     [2]
>     https://dvcs.w3.org/hg/ttml/raw-file/default/ttml10/spec/ttaf1-dfxp.html#element-vocab-type-content
>
>


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