> An XHTML document may have embedded SVG, how do you validate both the
> XHTML and the SVG?
>
> An XHTML document may have embedded MathML, how do you validate both
> the XHTML and the MathML?
while nvdl is a good thing, it's not strictly necessary for those cases,
as those DTD were all designed to conform to the requirements of xhtml
modularisation so can be plugged together to form a single
xhtml+mathml+svg dtd (which is known to the w3c's validator for example)
http://www.w3.org/TR/XHTMLplusMathMLplusSVG/
David
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