メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.908885087121 43.4911209637929, 141.908139880754 43.4915178828629, 141.907988292842 43.4910121351158, 141.908814207467 43.4908648695445, 141.908819343627 43.4908834511052, 141.908885087121 43.4911209637929)) ^^http://www.opengis.net/ont/geosparql#wktLiteral