メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.335741086483 43.7603384540159, 142.336498661804 43.7605815193891, 142.33587118083 43.7616323352294, 142.335122568526 43.7613976973115, 142.334342016947 43.7611569764805, 142.334964829004 43.7600843057334, 142.335724782862 43.7603157882141, 142.335717300198 43.7603286285485, 142.335741086483 43.7603384540159)) ^^http://www.opengis.net/ont/geosparql#wktLiteral