メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.5562500 34.9166667, 136.5625000 34.9166667, 136.5625000 34.9208334, 136.5562500 34.9208334, 136.5562500 34.9166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral