メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.259641953065 44.0245507485249, 144.25926625688 44.0251179815545, 144.257950193007 44.0246484983835, 144.258328691266 44.0240831165715, 144.259641953065 44.0245507485249)) ^^http://www.opengis.net/ont/geosparql#wktLiteral