メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.401087422677 44.1792242825116, 142.399428067215 44.1789542809566, 142.399600715341 44.1783631884731, 142.399796577392 44.1777625194536, 142.401467445722 44.1780098052864, 142.401298181942 44.1786223782501, 142.401087422677 44.1792242825116)) ^^http://www.opengis.net/ont/geosparql#wktLiteral