メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.6312500 40.4416667, 141.6375000 40.4416667, 141.6375000 40.4458334, 141.6312500 40.4458334, 141.6312500 40.4416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral