メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.2812500 43.2458334, 143.2875000 43.2458334, 143.2875000 43.2500000, 143.2812500 43.2500000, 143.2812500 43.2458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral