# File lib/edi4r/diagrams.rb, line 225
    def initialize(key, sg_name, root)
      #    puts "Creating branch for key `#{key+sg_name}'..."
      @key = key
      @sg_name = sg_name
      @root = root

      @nodelist=[]
      b = @root.dir.message( key+sg_name.to_s )
      raise "Lookup failed for key `#{key+sg_name.to_s}'" unless b
      @desc = b.desc
      b.each {|obj| @nodelist << Node.create( obj.name, obj.status, obj.maxrep )}
    end