メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.908996031331 43.4944352941302, 141.908962895027 43.4944399418486, 141.908741871209 43.4936119611014, 141.909574231937 43.4934998823039, 141.909826451182 43.494318074205, 141.908996031331 43.4944352941302)) ^^http://www.opengis.net/ont/geosparql#wktLiteral