メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.7875000 32.6875000, 129.7937500 32.6875000, 129.7937500 32.6916667, 129.7875000 32.6916667, 129.7875000 32.6875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral