メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.1937500 44.4375000, 143.2000000 44.4375000, 143.2000000 44.4416667, 143.1937500 44.4416667, 143.1937500 44.4375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral