メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.414181782771 43.7420964780246, 142.414220968838 43.7425890902666, 142.412349480845 43.7426961213187, 142.41024324772 43.7428057143866, 142.410154041152 43.7423066638425, 142.410100297625 43.7418310524626, 142.412251906598 43.7417186740295, 142.414134568864 43.7416208773947, 142.414181782771 43.7420964780246)) ^^http://www.opengis.net/ont/geosparql#wktLiteral