メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.5875000 34.6458334, 135.5937500 34.6458334, 135.5937500 34.6500000, 135.5875000 34.6500000, 135.5875000 34.6458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral