メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.775925360083 43.2051323133008, 141.775344629312 43.2057230599536, 141.774613436728 43.2053185271438, 141.774983954893 43.2049775638376, 141.774839785885 43.2048790695487, 141.775042078019 43.2046720171568, 141.775925360083 43.2051323133008)) ^^http://www.opengis.net/ont/geosparql#wktLiteral