メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.400970026084 44.1810796603443, 142.399652460453 44.1808817429477, 142.400013993581 44.1796955812639, 142.400904704848 44.1798605150527, 142.401543673927 44.1799691892071, 142.401456873379 44.1801359190124, 142.401191630313 44.1806455343285, 142.400970026084 44.1810796603443)) ^^http://www.opengis.net/ont/geosparql#wktLiteral