メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.2312500 39.4375000, 141.2375000 39.4375000, 141.2375000 39.4416667, 141.2312500 39.4416667, 141.2312500 39.4375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral