メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.5937500 33.2166667, 129.6000000 33.2166667, 129.6000000 33.2208334, 129.5937500 33.2208334, 129.5937500 33.2166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral