メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.384590724298 43.0432577854226, 141.384674616428 43.0432105236032, 141.385146331513 43.0436371247594, 141.383896974988 43.0444048328522, 141.383413936036 43.0439721626696, 141.382829523227 43.0434666333868, 141.384003593145 43.0427476709002, 141.384590724298 43.0432577854226)) ^^http://www.opengis.net/ont/geosparql#wktLiteral