メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3687500 37.2166667, 140.3750000 37.2166667, 140.3750000 37.2208334, 140.3687500 37.2208334, 140.3687500 37.2166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral