メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.0562500 43.6750000, 144.0625000 43.6750000, 144.0625000 43.6791667, 144.0562500 43.6791667, 144.0562500 43.6750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral