メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.6875000 31.7500000, 130.6937500 31.7500000, 130.6937500 31.7541667, 130.6875000 31.7541667, 130.6875000 31.7500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral