メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.1125000 37.5250000, 140.1187500 37.5250000, 140.1187500 37.5291667, 140.1125000 37.5291667, 140.1125000 37.5250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral