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Subject: Set operations in XACML
Minor proposal: It seems that provided set operations in the specifications are incomplete, as they do not provide a way to do difference of sets. I suggest that we add "type-except" (or type-difference, I slightly prefer except for being used in some other places) with a description: "This function SHALL take two arguments that are both a bag of type values. The expression SHALL return a bag of type such that it contains all elements that are in the first argument that are not in the second argument. No duplicates as determined by "urn:oasis:names:tc:xacml:1.0:function:type-equal" SHALL exist in the result." A use case would be to remove a particular value(s) from a bag/set. Daniel;
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