メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.9625000 35.2416667, 135.9687500 35.2416667, 135.9687500 35.2458334, 135.9625000 35.2458334, 135.9625000 35.2416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral