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<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>A clean way to insert
extraneous elements into SGML is to use NOTATION entities. This does not
work for HTML and it has never worked, although TBL did have such an idea for
images at the very beginning. It cannot be done because it is extremely
inconvenient for the author/publisher and very insecure on the WWW.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>Otherwise, you can think
of MATH and SVG in HTML5 as an analogue of SCRIPT, which is of course very weak
— but you cannot verify the validity of JavaScript code with a DTD either.
And you can have a DTD for XHTML5 with MathML and SVG using XML modularization
(although the WHATWG does not provide you with one). The DTD in question
would of course be an upper approximation of what is allowed.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>HTH,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>Chris</span></font><font
size=2 face=Arial><span lang=EN-US style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
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