メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.6937500 33.6458334, 130.7000000 33.6458334, 130.7000000 33.6500000, 130.6937500 33.6500000, 130.6937500 33.6458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral