メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.044786873577 42.914103470257, 143.045514892804 42.9141585581035, 143.045325712878 42.9156160249705, 143.044595741821 42.915566646318, 143.043848635966 42.9155055657927, 143.04405776056 42.9140489480009, 143.044786873577 42.914103470257)) ^^http://www.opengis.net/ont/geosparql#wktLiteral