メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.399482125153 44.1887786662328, 142.39850649076 44.1886214618738, 142.398659444886 44.1881263422356, 142.400051589202 44.1883627205811, 142.399482125153 44.1887786662328)) ^^http://www.opengis.net/ont/geosparql#wktLiteral