メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.5187500 33.5291667, 135.5250000 33.5291667, 135.5250000 33.5333333, 135.5187500 33.5333333, 135.5187500 33.5291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral