メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.522534184593 43.8547844411501, 141.52239684921 43.8550821640219, 141.52048338829 43.854630657879, 141.520517038762 43.8545367313047, 141.5185443323 43.8540573571719, 141.518814550284 43.8535267100135, 141.520197641417 43.8538801907072, 141.520507408562 43.8539270743294, 141.521435665192 43.8541575662153, 141.522085159065 43.8543413620454, 141.522684542808 43.8545065346756, 141.522534184593 43.8547844411501)) ^^http://www.opengis.net/ont/geosparql#wktLiteral