メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.0312500 35.2541667, 137.0375000 35.2541667, 137.0375000 35.2583333, 137.0312500 35.2583333, 137.0312500 35.2541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral