メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.0937500 26.5541667, 128.1000000 26.5541667, 128.1000000 26.5583333, 128.0937500 26.5583333, 128.0937500 26.5541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral