メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.6500000 33.5916667, 135.6562500 33.5916667, 135.6562500 33.5958334, 135.6500000 33.5958334, 135.6500000 33.5916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral