メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.363813167879 43.8322482773978, 142.363148528533 43.8319440471344, 142.361999728593 43.8314207899955, 142.364015528952 43.829925849992, 142.365474225059 43.8309402751904, 142.363813167879 43.8322482773978)) ^^http://www.opengis.net/ont/geosparql#wktLiteral