メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.8437500 35.6458334, 134.8500000 35.6458334, 134.8500000 35.6500000, 134.8437500 35.6500000, 134.8437500 35.6458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral