メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.907321070022 43.4823282504883, 141.906412678019 43.4824614426673, 141.906182310581 43.4816553949032, 141.906063838945 43.4812576709681, 141.906057133932 43.4812351830021, 141.906975060688 43.4810743136415, 141.907321070022 43.4823282504883)) ^^http://www.opengis.net/ont/geosparql#wktLiteral