メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.350514277987 43.0731115962198, 141.350473039081 43.0732720449765, 141.350343733382 43.0738415394843, 141.348779314174 43.0736199179722, 141.348932132853 43.0730637621132, 141.349056204904 43.0724921180549, 141.350618909278 43.072704508852, 141.350514277987 43.0731115962198)) ^^http://www.opengis.net/ont/geosparql#wktLiteral