メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.6187500 38.0666667, 139.6250000 38.0666667, 139.6250000 38.0708334, 139.6187500 38.0708334, 139.6187500 38.0666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral