メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.3875000 28.2875000, 129.3937500 28.2875000, 129.3937500 28.2916667, 129.3875000 28.2916667, 129.3875000 28.2875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral