メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.2500000 34.8166667, 135.2562500 34.8166667, 135.2562500 34.8208334, 135.2500000 34.8208334, 135.2500000 34.8166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral