URI functions

tracker:uri-is-parent

	tracker:uri-is-parent (?parent, ?uri)
      

Returns a boolean value expressing whether ?parent is a parent of ?uri.

tracker:uri-is-descendant

	tracker:uri-is-descendant (?uri1, ?uri2, ..., ?uriN, ?child)
      

Returns a boolean value expressing whether one of the given URIs are a parent (direct or indirect) of ?child.

tracker:string-from-filename

	tracker:string-from-filename (?filename)
      

Returns a UTF-8 string from a filename.