メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.348387277724 44.4816151948117, 142.347270227495 44.4813488973886, 142.34757786859 44.4807015104677, 142.348709216392 44.4809751757941, 142.348387277724 44.4816151948117)) ^^http://www.opengis.net/ont/geosparql#wktLiteral