メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.775042078019 43.2046720171568, 141.774839785885 43.2048790695487, 141.774983954893 43.2049775638376, 141.774613436728 43.2053185271438, 141.774008569996 43.2049775979124, 141.773820042167 43.2048905930356, 141.7743306049 43.2043613119184, 141.774361610067 43.2043302142469, 141.775042078019 43.2046720171568)) ^^http://www.opengis.net/ont/geosparql#wktLiteral