メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.379203407285 43.76993936664, 142.379543055677 43.7704783221844, 142.377982936388 43.7709228757938, 142.377680762072 43.7703856334294, 142.377382639413 43.7698411948124, 142.378883574941 43.7694183383436, 142.379203407285 43.76993936664)) ^^http://www.opengis.net/ont/geosparql#wktLiteral