メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.8937500 43.8250000, 143.9000000 43.8250000, 143.9000000 43.8291667, 143.8937500 43.8291667, 143.8937500 43.8250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral