[nondet]rdf_current_prefix(:Alias,
?URI)Query predefined prefixes and prefixes defined with
rdf_register_prefix/2
and local prefixes defined with
rdf_prefix/2. If Alias is
unbound and one URI is the prefix of another, the longest is
returned first. This allows turning a resource into a prefix/local
couple using the simple enumeration below. See rdf_global_id/2.
rdf_current_prefix(Prefix, Expansion),
atom_concat(Expansion, Local, URI),