メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.6625000 35.6416667, 134.6687500 35.6416667, 134.6687500 35.6458334, 134.6625000 35.6458334, 134.6625000 35.6416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral