メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.5187500 42.7416667, 143.5250000 42.7416667, 143.5250000 42.7458334, 143.5187500 42.7458334, 143.5187500 42.7416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral