メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.3312500 43.2291667, 143.3375000 43.2291667, 143.3375000 43.2333333, 143.3312500 43.2333333, 143.3312500 43.2291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral