メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6625000 35.7166667, 140.6687500 35.7166667, 140.6687500 35.7208334, 140.6625000 35.7208334, 140.6625000 35.7166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral