メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.048024217068 42.9130067268538, 143.048782546943 42.9130577794121, 143.048580743888 42.9143835397811, 143.047845795287 42.9143290178689, 143.047054877598 42.9142712237863, 143.04723583584 42.9129515193919, 143.048024217068 42.9130067268538)) ^^http://www.opengis.net/ont/geosparql#wktLiteral