メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.401487442801 44.1603905967865, 142.399623836796 44.1601021084681, 142.40009619587 44.1586496082702, 142.400934558621 44.1587834274958, 142.400991174529 44.1593396524326, 142.401545260878 44.1601777737257, 142.401487442801 44.1603905967865)) ^^http://www.opengis.net/ont/geosparql#wktLiteral