メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.6562500 42.7000000, 143.6625000 42.7000000, 143.6625000 42.7041667, 143.6562500 42.7041667, 143.6562500 42.7000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral