メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.7187500 33.1916667, 129.7250000 33.1916667, 129.7250000 33.1958334, 129.7187500 33.1958334, 129.7187500 33.1916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral