メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.388739403498 43.763471783343, 142.388778222755 43.7639295504799, 142.38813236717 43.764103209836, 142.387860786407 43.7635846465318, 142.38773595967 43.7633734787392, 142.387544534931 43.7630412420604, 142.388651644132 43.7627259661929, 142.388674444618 43.7629242641447, 142.388739403498 43.763471783343)) ^^http://www.opengis.net/ont/geosparql#wktLiteral