メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.7500000 33.2916667, 129.7562500 33.2916667, 129.7562500 33.2958334, 129.7500000 33.2958334, 129.7500000 33.2916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral