メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.8812500 35.1958334, 136.8875000 35.1958334, 136.8875000 35.2000000, 136.8812500 35.2000000, 136.8812500 35.1958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral