メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.2000000 42.9208334, 143.2062500 42.9208334, 143.2062500 42.9250000, 143.2000000 42.9250000, 143.2000000 42.9208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral