メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.8687500 32.7541667, 129.8750000 32.7541667, 129.8750000 32.7583333, 129.8687500 32.7583333, 129.8687500 32.7541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral