[xacml-comment] The footnote 1 in Appendix A.4

There is a footnote in Appendix A.4.
An earlier RFC, RFC 1779 "A String Representation of Distinguished Names",
is less restrictive,
so xacml:x500Name uses the syntax in RFC 2253 for better interoperability

xacml:x500Name should be replaced with the correct identifier.

Satoshi Hada
IBM Tokyo Research Laboratory
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