A test to determine whether a specified is a member of a specified .

A component is a member of a reference set if at least one row in that reference set has a that matches the identifier of that component. Otherwise, a component is not a member of that reference set.
Reference set membership tests may be used to filter searches or as part of a or query.
In an expression constraint a reference set membership test is represented by the symbol ^ followed by a identifying the reference set.

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