メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.354653175636 43.781840231817, 142.354303889786 43.7820819567495, 142.353718220957 43.7816641139323, 142.353582293772 43.7812830914241, 142.355340902998 43.7809656362487, 142.355594840355 43.7811585749817, 142.354922674582 43.7816397547486, 142.354653175636 43.781840231817)) ^^http://www.opengis.net/ont/geosparql#wktLiteral