メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.0937500 43.1541667, 143.1000000 43.1541667, 143.1000000 43.1583333, 143.0937500 43.1583333, 143.0937500 43.1541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral