メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.1250000 40.1458334, 141.1312500 40.1458334, 141.1312500 40.1500000, 141.1250000 40.1500000, 141.1250000 40.1458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral