メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.7125000 32.5916667, 131.7187500 32.5916667, 131.7187500 32.5958334, 131.7125000 32.5958334, 131.7125000 32.5916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral