メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.3937500 28.3541667, 129.4000000 28.3541667, 129.4000000 28.3583333, 129.3937500 28.3583333, 129.3937500 28.3541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral