メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.38773595967 43.7633734787392, 142.387860786407 43.7635846465318, 142.38813236717 43.764103209836, 142.386772715379 43.7644836170281, 142.386499082506 43.7640062083294, 142.386490545957 43.7639913106297, 142.386185476926 43.7634445489745, 142.386837311352 43.7632552980242, 142.387544534931 43.7630412420604, 142.38773595967 43.7633734787392)) ^^http://www.opengis.net/ont/geosparql#wktLiteral