メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.40791172638 44.1798595954941, 142.406968018503 44.1806209910003, 142.405496940106 44.1796519861959, 142.405519687542 44.1795849072256, 142.405816627806 44.1786091139189, 142.405854562304 44.1784844436214, 142.40791172638 44.1798595954941)) ^^http://www.opengis.net/ont/geosparql#wktLiteral