メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.347660410409 44.4852653663978, 142.347542402883 44.4854897640614, 142.346628066723 44.4852462762763, 142.347042358449 44.484402032458, 142.34704664604 44.4843932753899, 142.347096972285 44.4844057821692, 142.347955190278 44.4846188688286, 142.347660410409 44.4852653663978)) ^^http://www.opengis.net/ont/geosparql#wktLiteral