メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.6062500 34.7916667, 135.6125000 34.7916667, 135.6125000 34.7958334, 135.6062500 34.7958334, 135.6062500 34.7916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral