メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.432854231428 43.770551055866, 142.432930102916 43.7711748357259, 142.430056327109 43.7713355998701, 142.429988926781 43.7707145995993, 142.429970774163 43.7704289610359, 142.43283500383 43.7702831583409, 142.432854231428 43.770551055866)) ^^http://www.opengis.net/ont/geosparql#wktLiteral