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Polyglot Markup - serializer questions
- From: David <dlee@calldei.com>
- To: xml-dev@lists.xml.org
- Date: Thu, 08 Jul 2010 12:37:39 -0400
Thanks to Twitter ( and @xquery ) I stumbled on this
http://www.w3.org/TR/html-polyglot/
I think the goals are excellent, but I do have some questions for 'the
experts'.
1) Why is this useful instead of sticking to xhtml ? The Abstract says
"Polyglot
markup that meets these constraints as interpreted as compatible,
regardless of whether they are processed as HTML or as XHTML, per the
HTML5 specification"
But I dont quite get why this is necessary ? I'm sure I'm missing the
obvious, people dont (usually) write specs just for the fun of it.
2) New XML serializer implementations ?
The doc discusses the difference between empty tags which are EMPTY vs
not. E.g. says to use <br/> but not <p/> (instead use
<p></p>)
This would imply (?) that an XML serializer would need to know when its
OK and not to compress empty tags.
Serializers such as Saxon with html encoding do this but they do it
differently ... e.g a <br/> in XML becomes <br> in html
mode.
Does following this standard imply that we need new output methods for
serializers? Or do we have to force serializers to not do any empty
element optimization and leave it up to the input code
generation/source ?
I think this might be difficult in something like xquery or xslt using
dynamic element construction where its not explicit which empty element
form is used.
e.g in xquery ... how does the serializer know to expand
<p></p> but not <br/> ?
element { "p" } {}
element { "br" } {}
-David
--
-------------------------
David A. Lee
dlee@calldei.com
http://www.calldei.com
http://www.xmlsh.org
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