メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.7875000 34.4875000, 135.7937500 34.4875000, 135.7937500 34.4916667, 135.7875000 34.4916667, 135.7875000 34.4875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral