メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.1250000 39.2375000, 141.1312500 39.2375000, 141.1312500 39.2416667, 141.1250000 39.2416667, 141.1250000 39.2375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral