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The xtransform iterator does not change the attached namespace information for
XML elements which are just traversed. The generic comparison operator cannot
distinguish two XML elements which only differ by the attached namespace
information.
4.6 Miscellaneous
Contrary to the W3C Namespaces in XML 1.1 Candidate Recommendation, a CDuce
declaration namespace p = "" does not undeclare the prefix p. Instead, it binds it
to the null namespace (that is, a QName using this prefix is interpreted as having no
namespace).
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