メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.391575263495 44.1783317070294, 142.390427219134 44.1781505564248, 142.390704395686 44.1771986770566, 142.391873387243 44.1773985928644, 142.391575263495 44.1783317070294)) ^^http://www.opengis.net/ont/geosparql#wktLiteral