メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.6500000 44.2041667, 143.6562500 44.2041667, 143.6562500 44.2083333, 143.6500000 44.2083333, 143.6500000 44.2041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral