メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.8625000 35.3875000, 136.8687500 35.3875000, 136.8687500 35.3916667, 136.8625000 35.3916667, 136.8625000 35.3875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral