メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.4000000 41.2375000, 141.4062500 41.2375000, 141.4062500 41.2416667, 141.4000000 41.2416667, 141.4000000 41.2375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral