[NTG-context] redefining xmlsetups inside a XML document

[mf]

Hello,
I'm trying to add new templates (xmlsetups) from the XML document itself.

See the attached MWE.

- the XML document is a simple XHTML file

- in the "head" element there's a "script" element with the "type" 
attribute set to "text/vnd.context", whose contents are then passed to 
\xmlcontext

- the "body" element has a "data-xmlsetups" attribute whose value should 
tell which xmlsetups is to be applied on the body contents (it's defined 
in the "script" element above)

If it worked, the resulting PDF should show the body element, followed 
by a "Hello world!" paragraph written in red.
But it does not work, because there's something I'm missing in the 
redefinition and application of xmlsetups.

To try the MWE, type:

context --environment=nested-xmlsetup.tex --forcexml nested-xmlsetup.xhtml

Massi
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