メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.8687500 33.3708334, 129.8750000 33.3708334, 129.8750000 33.3750000, 129.8687500 33.3750000, 129.8687500 33.3708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral