メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.368526983661 43.7730603210594, 142.3688330063 43.7735845532339, 142.367351489256 43.7740243430299, 142.367054428136 43.773481270172, 142.366942142398 43.7732430641858, 142.36768500872 43.7730421236352, 142.368555252829 43.7727893608458, 142.368698030636 43.7730048902173, 142.368526983661 43.7730603210594)) ^^http://www.opengis.net/ont/geosparql#wktLiteral