メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.1187500 43.3916667, 145.1250000 43.3916667, 145.1250000 43.3958334, 145.1187500 43.3958334, 145.1187500 43.3916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral