メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.4250000 31.6041667, 130.4312500 31.6041667, 130.4312500 31.6083333, 130.4250000 31.6083333, 130.4250000 31.6041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral