メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.7125000 39.6750000, 141.7187500 39.6750000, 141.7187500 39.6791667, 141.7125000 39.6791667, 141.7125000 39.6750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral