メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.1562500 44.2125000, 142.1625000 44.2125000, 142.1625000 44.2166667, 142.1562500 44.2166667, 142.1562500 44.2125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral