メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.6562500 34.7416667, 135.6625000 34.7416667, 135.6625000 34.7458334, 135.6562500 34.7458334, 135.6562500 34.7416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral