メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3250000 40.7958334, 140.3312500 40.7958334, 140.3312500 40.8000000, 140.3250000 40.8000000, 140.3250000 40.7958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral