Unfortunately the copy at /TR/MathML2/dtd/ is still there (relating to
earlier versions of MathML) and generates errors with some common XML
parsers, in particular due to lack of namespace awareness in the choice
of processing instruction names.
SXXP0003: Error reported by XML parser: A colon is not allowed in
the name 'IS10744:arch'
The use of IS10744:arch affects all the "standard" xhtml dtd as well as
the xhtml+mathml one.
but I'm not sure if that is allowed because of the stability
requirements of the TR area.
(Maintainer of the MathML DTD responding to reports about the old
MathML DTD, which a user confirmed he was led to by this reference in
the XHTML recommendation.)
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