メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.8125000 45.2958334, 141.8187500 45.2958334, 141.8187500 45.3000000, 141.8125000 45.3000000, 141.8125000 45.2958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral