メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.1250000 42.6916667, 143.1312500 42.6916667, 143.1312500 42.6958334, 143.1250000 42.6958334, 143.1250000 42.6916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral