メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.047845795287 42.9143290178689, 143.048580743888 42.9143835397811, 143.048504334742 42.914931537602, 143.048388693398 42.9158389953207, 143.048387963736 42.9158454705088, 143.047662248602 42.9157923599774, 143.046865740178 42.9157291169215, 143.047054877598 42.9142712237863, 143.047845795287 42.9143290178689)) ^^http://www.opengis.net/ont/geosparql#wktLiteral