[xacml-comment] The type of the RequestContextPath attribute

The current type of the RequestContextPath attribute is xs:anyURI. (Section
5.31)
I don't think that a valid XPath expression is always a valid URI
(according to RFC2396).
So I think the type should be xs:string rather than xs:anyURI.
Please correct me if I'm wrong.

In the XML-Signature specification, the type of XPath expressions is
xs:string.

Satoshi Hada
IBM Tokyo Research Laboratory
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