メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.4250000 43.3500000, 144.4312500 43.3500000, 144.4312500 43.3541667, 144.4250000 43.3541667, 144.4250000 43.3500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral