メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((123.8875000 24.2875000, 123.8937500 24.2875000, 123.8937500 24.2916667, 123.8875000 24.2916667, 123.8875000 24.2875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral