メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.1312500 38.7791667, 141.1375000 38.7791667, 141.1375000 38.7833333, 141.1312500 38.7833333, 141.1312500 38.7791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral