メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.369768761608 43.7688731621705, 142.368257368903 43.7693015763974, 142.367956556844 43.7687636110314, 142.369468466341 43.768327007077, 142.369768761608 43.7688731621705)) ^^http://www.opengis.net/ont/geosparql#wktLiteral