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How about we pick up the string handling functions from XPath 2.0 function library? That may simplify implementation. We would need to generalize its semantics to deal with XACML data model, but the basic functionality (and names) should be similar. I am not sure what an "integer-contains" function ...

I have promised to look at #67, but was out of town/time recently. Whatever language we come up with - I should probably review it on the XPath working group - we have a face to face in early October. They are usually very helpful with reviewing standards referencing XPath/XQuery. Daniel;

P.S. For some reason my browser opens the second URL in a wrong place in a document (correct section was 2.6.3 Type Hierarchy)