| http://www.w3.org/ns/prov#value | - Constraints are preferably expressions formed from conditions and Boolean operators NOT, AND, and OR. Three kinds of built-in conditions may be used: 1) relational operations=,<>,<,<=,>,>=on integers; 2) relational operations=,<>, LIKE, NOTLIKE on strings (the operator LIKE takes a string and a pattern and evaluates to true if the string matches the pattern, the operator NOTLIKE is the negation of
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