メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.4187500 43.3666667, 144.4250000 43.3666667, 144.4250000 43.3708334, 144.4187500 43.3708334, 144.4187500 43.3666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral