メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((132.6937500 34.4458334, 132.7000000 34.4458334, 132.7000000 34.4500000, 132.6937500 34.4500000, 132.6937500 34.4458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral