メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.2312500 45.2625000, 142.2375000 45.2625000, 142.2375000 45.2666667, 142.2312500 45.2666667, 142.2312500 45.2625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral