メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7250000 37.8625000, 140.7312500 37.8625000, 140.7312500 37.8666667, 140.7250000 37.8666667, 140.7250000 37.8625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral