メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.8500000 43.8166667, 143.8562500 43.8166667, 143.8562500 43.8208334, 143.8500000 43.8208334, 143.8500000 43.8166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral