メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.5437500 35.9958334, 136.5500000 35.9958334, 136.5500000 36.0000000, 136.5437500 36.0000000, 136.5437500 35.9958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral