メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.399301370567 44.1820981458063, 142.398486944872 44.1819573771372, 142.398857834572 44.1807450118341, 142.399652460453 44.1808817429477, 142.399301370567 44.1820981458063)) ^^http://www.opengis.net/ont/geosparql#wktLiteral