メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.046466560944 42.9129011665106, 143.04723583584 42.9129515193919, 143.047054877598 42.9142712237863, 143.046294673395 42.9142170080956, 143.045514892804 42.9141585581035, 143.04571295745 42.9128420442563, 143.046466560944 42.9129011665106)) ^^http://www.opengis.net/ont/geosparql#wktLiteral