メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.385874660314 42.9879056865427, 144.384245725429 42.9876214000526, 144.384444145447 42.9870277110405, 144.38530290296 42.9871794002381, 144.38532733659 42.9871105138339, 144.386029573869 42.9874225178659, 144.385874660314 42.9879056865427)) ^^http://www.opengis.net/ont/geosparql#wktLiteral