メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.325906300288 43.7649869944075, 142.326405726479 43.7651417372838, 142.326099344787 43.7656745919626, 142.325772667321 43.766238576337, 142.32525151238 43.7660852350113, 142.324507480416 43.7658534336474, 142.325157151456 43.7647462874448, 142.325906300288 43.7649869944075)) ^^http://www.opengis.net/ont/geosparql#wktLiteral