メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.7062500 35.2000000, 138.7125000 35.2000000, 138.7125000 35.2041667, 138.7062500 35.2041667, 138.7062500 35.2000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral