メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.0687500 35.8166667, 138.0750000 35.8166667, 138.0750000 35.8208334, 138.0687500 35.8208334, 138.0687500 35.8166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral