メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.5500000 42.9875000, 141.5562500 42.9875000, 141.5562500 42.9916667, 141.5500000 42.9916667, 141.5500000 42.9875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral