メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.7937500 34.3458334, 136.8000000 34.3458334, 136.8000000 34.3500000, 136.7937500 34.3500000, 136.7937500 34.3458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral