メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.3250000 38.0583333, 139.3312500 38.0583333, 139.3312500 38.0625000, 139.3250000 38.0625000, 139.3250000 38.0583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral