メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.4875000 43.5208334, 144.4937500 43.5208334, 144.4937500 43.5250000, 144.4875000 43.5250000, 144.4875000 43.5208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral