メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.9937500 32.0041667, 131.0000000 32.0041667, 131.0000000 32.0083333, 130.9937500 32.0083333, 130.9937500 32.0041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral