メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.5625000 28.4500000, 129.5687500 28.4500000, 129.5687500 28.4541667, 129.5625000 28.4541667, 129.5625000 28.4500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral