メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.948691999973 43.5314894881127, 144.948095686781 43.5319751321404, 144.946436952073 43.5309309168765, 144.946187325487 43.5307385421683, 144.946461370152 43.5304642996112, 144.947422130329 43.5309119167254, 144.948691999973 43.5314894881127)) ^^http://www.opengis.net/ont/geosparql#wktLiteral