メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.910583162587 43.5220854707229, 141.908930972534 43.5223600113462, 141.908578505558 43.5210873920997, 141.908899425852 43.5207616849432, 141.909017224226 43.5206128375598, 141.910152129605 43.520413175752, 141.910607371408 43.5220767512492, 141.910583162587 43.5220854707229)) ^^http://www.opengis.net/ont/geosparql#wktLiteral