メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3187500 37.3625000, 140.3250000 37.3625000, 140.3250000 37.3666667, 140.3187500 37.3666667, 140.3187500 37.3625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral