メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.9437500 33.6291667, 135.9500000 33.6291667, 135.9500000 33.6333333, 135.9437500 33.6333333, 135.9437500 33.6291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral