メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.6187500 34.1166667, 135.6250000 34.1166667, 135.6250000 34.1208334, 135.6187500 34.1208334, 135.6187500 34.1166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral