メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.7250000 37.5916667, 139.7312500 37.5916667, 139.7312500 37.5958334, 139.7250000 37.5958334, 139.7250000 37.5916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral