メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.1375000 26.6791667, 128.1437500 26.6791667, 128.1437500 26.6833333, 128.1375000 26.6833333, 128.1375000 26.6791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral