メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.0500000 34.9708334, 135.0562500 34.9708334, 135.0562500 34.9750000, 135.0500000 34.9750000, 135.0500000 34.9708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral