メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.049368562466 42.9144418383483, 143.050109113999 42.9144965923044, 143.049908986673 42.915942612707, 143.049163465213 42.9158897903251, 143.048388693398 42.9158389953207, 143.048504334742 42.914931537602, 143.048580743888 42.9143835397811, 143.049368562466 42.9144418383483)) ^^http://www.opengis.net/ont/geosparql#wktLiteral