Succeeds if Key is a key in the map and unify Answer
with the number of values associated with the key. This provides a fast
test of existence without fetching the possibly large associated value
set as with rdf_find_literal_map/3.
Unify Answer with an ordered set of all keys that have the
given prefix. Prefix must be an atom. This call is intended
for auto-completion in user interfaces.
Unify Answer with all keys that are larger or equal to the
Unify Answer with all keys that are smaller or equal to the
Unify Answer with all keys between Min and Max
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