メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.4312500 34.8458334, 137.4375000 34.8458334, 137.4375000 34.8500000, 137.4312500 34.8500000, 137.4312500 34.8458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral