メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.390427219134 44.1781505564248, 142.389960015507 44.1780748145901, 142.389884776729 44.1777075039991, 142.389876122707 44.1775298590698, 142.389992335652 44.1770899936477, 142.390704395686 44.1771986770566, 142.390427219134 44.1781505564248)) ^^http://www.opengis.net/ont/geosparql#wktLiteral