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Hi Wendell, all,
My “xpath-default-namespace" solution worked when I modified only MathML content, but it failed when I tried to modify both MathML and HTML content. :(
Your note that XSLT documents themselves follow XML namespace rules got me thinking… and I also came across the November 2013 solution from Ian Roberts here, suggesting pertinent default namespaces on the <xsl:template> element themselves:
https://stackoverflow.com/questions/20090833/best-solution-dealing-with-default-namespaces-in-xml-and-xslt
and that seemed like a perfect and intuitive solution! But I can’t get it to work.
Given this input document (HTML top level, MathML within):
<html>
<head>
<title>Equations</title>
</head>
<body>
<p>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mi>m</mi>
</math>
</p>
</body>
</html>
and this stylesheet:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
exclude-result-prefixes="xs"
version="2.0">
<!-- baseline identity transform -->
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="p">
<div>
<xsl:copy-of select="."/>
</div>
</xsl:template>
<xsl:template xmlns="http://www.w3.org/1998/Math/MathML" match="mi">
<mrow>
<xsl:copy-of select="."/>
</mrow>
</xsl:template>
</xsl:stylesheet>
the template for HTML <p> fires, but the template for MathML <mi> does not. What am I doing wrong? I tried other solutions and I haven’t found anything to allow me to modify content in both namespace domains.
Thanks!!
* Chris
From: Wendell Piez [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>>
Sent: Wednesday, November 4, 2020 11:12 AM
To: [email protected]<mailto:[email protected]>
Subject: Re: [xsl] HTML5 and MathML and namespaces, oh my
Chris,
Awesome. You have about cracked the namespace conundrum. Part of the key is to see that the XSLT is also an XML document and follows all the same rules as any other XML document as to its namespaces.
So:
> Why would the XSLT serializer write explicit namespace references that aren’t needed by context?
In this case, all the declarations in samples you have shown are needed with the exception of the stray binding to an 'mml' prefix, which you removed. They would not be needed if the processor (say) assigned all its own prefixes to names, instead of using the names as given in the XSLT. But we would hate that. So it does its best to give us what we need, with the names it thinks we want.
> Isn’t the point of namespaces that everything is fully qualified internally, then the output can adjust accordingly?
Yes! As you've discovered, that can require some jiggery when multiple vocabularies are competing for unprefixed names (or the same prefixes).
> How do I get a clean <math> island of MathML content without namespace stuff cluttering up its contents?
Bravo! Actually with a little practice you can make it so your code is reasonably clean even in mixed-namespace use cases.
Old project: https://github.com/wendellpiez/XMLNamespaceFixup<https://urldefense.com/v3/__https:/github.com/wendellpiez/XMLNamespaceFixup__;!!A4F2R9G_pg!Jhl_IDRYqlo2VzhBevEPT2OWcoGcLIPmsruLOTbumPfCYoJ_cCkeVydWWU_RjqAl8DdrvKRO1IBfYvM$> (but if you do things right you'll never need it).
Cheers, Wendell
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