メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7125000 41.8375000, 140.7187500 41.8375000, 140.7187500 41.8416667, 140.7125000 41.8416667, 140.7125000 41.8375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral