メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.6937500 31.4875000, 130.7000000 31.4875000, 130.7000000 31.4916667, 130.6937500 31.4916667, 130.6937500 31.4875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral