Element Sets: A Minimal Basis for an XML Query Enginehttps://www.w3.org/TandS/QL/QL98/pp/sets.html
also one or more cross references. set1 = Set('Paragraph') within Set('Introduction') set2 = set1 including Set('footnote') set3 = set2 including Set('xref') Set Arithmetic The st
That's everything I could find.
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