メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4250000 39.0041667, 140.4312500 39.0041667, 140.4312500 39.0083333, 140.4250000 39.0083333, 140.4250000 39.0041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral