The w3c schema has an error that causes it to differ
from the DTD. <valRng> and <invalRng> have a choice of
0-many <item> or <range> elements within them. This
issue cause the w3c schema not to validate correctly
content that is valid against the DTD.
Proposal Document
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This issue has been corrected in the cvs tree for versions
2.0 and 2.1
See the following diffs for details:
http://cvs.sourceforge.net/viewcvs.py/ddi-alliance/ddi/w3c/Version2-1.xsd?r1=1.5&r2=1.6
http://cvs.sourceforge.net/viewcvs.py/ddi-alliance/ddi/w3c/Version2-0.xsd?r1=1.9&r2=1.10