メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.405519687542 44.1795849072256, 142.404459502435 44.1794192535351, 142.404739734902 44.1784411991961, 142.405816627806 44.1786091139189, 142.405519687542 44.1795849072256)) ^^http://www.opengis.net/ont/geosparql#wktLiteral