メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.39119099839 44.1756942716318, 142.390457731726 44.1755807639334, 142.390742733419 44.1747036373925, 142.390747364007 44.1746893928785, 142.39146366423 44.1747953070274, 142.39119099839 44.1756942716318)) ^^http://www.opengis.net/ont/geosparql#wktLiteral