メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.5875000 42.2458334, 142.5937500 42.2458334, 142.5937500 42.2500000, 142.5875000 42.2500000, 142.5875000 42.2458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral