メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.9937500 26.6208334, 128.0000000 26.6208334, 128.0000000 26.6250000, 127.9937500 26.6250000, 127.9937500 26.6208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral