メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.380754186648 43.7695221265555, 142.379203407285 43.76993936664, 142.378883574941 43.7694183383436, 142.380447932018 43.7689811858059, 142.380754186648 43.7695221265555)) ^^http://www.opengis.net/ont/geosparql#wktLiteral