メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.347694012411 43.0651658470382, 141.346131212951 43.0649540515264, 141.346285785403 43.0643438983805, 141.346444632267 43.0637429217729, 141.347981948745 43.0639569722746, 141.347694012411 43.0651658470382)) ^^http://www.opengis.net/ont/geosparql#wktLiteral