メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.880966578832 43.0167029909375, 142.879826111728 43.0159846572761, 142.880787475451 43.0151389393267, 142.880871599109 43.015187918244, 142.881944763432 43.0158626566781, 142.880966578832 43.0167029909375)) ^^http://www.opengis.net/ont/geosparql#wktLiteral