メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.7500000 32.7333333, 128.7562500 32.7333333, 128.7562500 32.7375000, 128.7500000 32.7375000, 128.7500000 32.7333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral