メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.356270329101 43.7816443785032, 142.355611170804 43.7821255499903, 142.355335173446 43.7823354582279, 142.355011654537 43.7825759478025, 142.354303889786 43.7820819567495, 142.354653175636 43.781840231817, 142.354922674582 43.7816397547486, 142.355594840355 43.7811585749817, 142.356270329101 43.7816443785032)) ^^http://www.opengis.net/ont/geosparql#wktLiteral