メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6937500 33.7416667, 129.7000000 33.7416667, 129.7000000 33.7458334, 129.6937500 33.7458334, 129.6937500 33.7416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral