メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.0500000 33.0250000, 129.0562500 33.0250000, 129.0562500 33.0291667, 129.0500000 33.0291667, 129.0500000 33.0250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral