メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.2312500 44.2166667, 143.2375000 44.2166667, 143.2375000 44.2208334, 143.2312500 44.2208334, 143.2312500 44.2166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral