メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.346032496947 43.7484009192812, 142.346559029634 43.7485723176509, 142.347780650845 43.7489649960687, 142.346960571738 43.7503393097644, 142.346876134735 43.750449646299, 142.344543360339 43.7497706893068, 142.344795130932 43.7493498144168, 142.345444673337 43.748220342189, 142.346032496947 43.7484009192812)) ^^http://www.opengis.net/ont/geosparql#wktLiteral