[IMP] document subset/superset operations
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@ -91,6 +91,10 @@ preserve order.
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* ``record in set`` returns whether ``record`` (which must be a 1-element
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recordset) is present in ``set``. ``record not in set`` is the inverse
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operation
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* ``set1 <= set2`` and ``set1 < set2`` return whether ``set1`` is a subset
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of ``set2`` (resp. strict)
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* ``set1 >= set2`` and ``set1 > set2`` return whether ``set1`` is a superset
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of ``set2`` (resp. strict)
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* ``set1 | set2`` returns the union of the two recordsets, a new recordset
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containing all records present in either source
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* ``set1 & set2`` returns the intersection of two recordsets, a new recordset
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