メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7687500 41.8416667, 140.7750000 41.8416667, 140.7750000 41.8458334, 140.7687500 41.8458334, 140.7687500 41.8416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral