メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6500000 33.2500000, 129.6562500 33.2500000, 129.6562500 33.2541667, 129.6500000 33.2541667, 129.6500000 33.2500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral