メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6125000 37.7458334, 140.6187500 37.7458334, 140.6187500 37.7500000, 140.6125000 37.7500000, 140.6125000 37.7458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral