[xacml-comment] syntactic errors in XACML schemas

Each of the two schemas available on
http://www.oasis-open.org/committees/xacml/ has an error that prevents it
being parsed.

cs-xacml-schema-policy-01.xsd: the Xerces Java error message shows that
because the AttributeAssignmentType complex type is a derived type, it must
be declared as mixed or element-only, depending on whether its base type is
mixed or element-only. Because AttributeValueType, the base type, has
mixed="true" in its declaration, I added this to the declaration for
AttributeAssignmentType and Xerces now parses it without a problem. Is this
the fix that people should assume is in place when actually using XACML?

cs-xacml-schema-context-01.xsd just has a typo: the "-1.0" in the import
statement near the beginning should read "-01" if it's going to read the
cs-xacml-schema-policy-01.xsd file mentioned above, which it needs to do.

Bob DuCharme
Consulting Software Engineer, LexisNexis