prov:value
| - Valid atomic terms are: t1 ?? t2, t1 ?? c, t1 IN s1, s1 CONTAINS s2, ?? ?? any s1, and EXISTS s1, where t1 and t2 are single-valued path expressions, s1 and s2 are sets, ?? is a single-valued path expression or a constant, c is a constant (integer or string), and ?? is a comparison operator.
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