メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.4500000 33.7375000, 135.4562500 33.7375000, 135.4562500 33.7416667, 135.4500000 33.7416667, 135.4500000 33.7375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral