メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6687500 35.8958334, 140.6750000 35.8958334, 140.6750000 35.9000000, 140.6687500 35.9000000, 140.6687500 35.8958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral