メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.9000000 43.8041667, 143.9062500 43.8041667, 143.9062500 43.8083333, 143.9000000 43.8083333, 143.9000000 43.8041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral