メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.7187500 43.4791667, 144.7250000 43.4791667, 144.7250000 43.4833333, 144.7187500 43.4833333, 144.7187500 43.4791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral