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Comment by rleisti | Hacker News Reader

What I'd really like, is a way to express xml in xml, so I can be super-productive all day long recursively writing a single xml document.

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You want XSLT. ;-)

that comment was gold

XPath is far too concise. It needs an XML encoding. Something like PMML, where math looks like

  <DefineFunction name="frob" optype="continuous"> 
    <ParameterField name="x" optype="continuous"/> 
    <Apply function="+">
      <FieldRef field="x"/>
      <Constant>42</Constant>
    </Apply>
  </DefineFunction>

I wish I were joking.

Content MathML to the rescue: http://en.wikipedia.org/wiki/MathML#Content_MathML

I think you'd also need a way to express that xml xml using xml as well.

XXMLML?

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