メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.4500000 35.0041667, 135.4562500 35.0041667, 135.4562500 35.0083333, 135.4500000 35.0083333, 135.4500000 35.0041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral