メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.2562500 31.2625000, 130.2625000 31.2625000, 130.2625000 31.2666667, 130.2562500 31.2666667, 130.2562500 31.2625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral