* SAX.c valid.c include/libxml/valid.h: fixed bug #92518 validation
error were not covering namespace declarations.
* result/valid/dia.xml test/valid/dia.xml: the test wasn't valid,
it was missing the attribute declaration for the namespace
* result/VC/NS3: the fix now report breakages in that test
Daniel
* valid.c include/libxml/tree.h: trying to fix namespaces +
validation problems for good, closing #63619 in the process
* result/valid/dia.xml test/valid/dia.xml: the Dia test was
wrong in this respect, fixed it.
Daniel
