メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.8687500 35.0666667, 135.8750000 35.0666667, 135.8750000 35.0708334, 135.8687500 35.0708334, 135.8687500 35.0666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral