メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.6875000 35.5000000, 134.6937500 35.5000000, 134.6937500 35.5041667, 134.6875000 35.5041667, 134.6875000 35.5000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral