メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.3875000 41.2916667, 141.3937500 41.2916667, 141.3937500 41.2958334, 141.3875000 41.2958334, 141.3875000 41.2916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral