メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.9437500 35.2458334, 134.9500000 35.2458334, 134.9500000 35.2500000, 134.9437500 35.2500000, 134.9437500 35.2458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral