メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.0375000 42.6791667, 143.0437500 42.6791667, 143.0437500 42.6833333, 143.0375000 42.6833333, 143.0375000 42.6791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral