メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.2937500 33.9875000, 135.3000000 33.9875000, 135.3000000 33.9916667, 135.2937500 33.9916667, 135.2937500 33.9875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral