    # File lib/graphviz.rb, line 761
      def initialize( xGraphName, hOpts = {}, &block )
        @filename = nil
        @name     = xGraphName.to_s
        @format   = @@format
        @prog     = @@prog
        @path     = @@path
        @errors   = @@errors
        @extlibs  = @@extlibs
        @output   = {}
        @nothugly = false
        @strict   = false

        @scale        = nil
        @inverty      = nil
        @no_layout    = nil
        @reduce_graph = nil
        @Lg           = nil
        @LO           = nil
        @Ln           = nil
        @LU           = nil
        @LC           = nil
        @LT           = nil

        @elements_order = GraphViz::Elements::new()

        @oParentGraph = nil
        @oGraphType   = "digraph"

        @hoNodes  = Hash::new()
        @loEdges  = Array::new()
        @hoGraphs = Hash::new()

        @node  = GraphViz::Attrs::new( self, "node",  NODESATTRS  )
        @edge  = GraphViz::Attrs::new( self, "edge",  EDGESATTRS  )
        @graph = GraphViz::Attrs::new( self, "graph", GRAPHSATTRS )

        hOpts.each do |xKey, xValue|
          case xKey.to_s
            when "output"
              warn ":output option is deprecated, please use :<format> => :<file>"
              if FORMATS.index( xValue.to_s ).nil? == true
                raise ArgumentError, "output format '#{xValue}' invalid"
              end
              @format = xValue.to_s
            when "use"
              if PROGRAMS.index( xValue.to_s ).nil? == true
                raise ArgumentError, "can't use '#{xValue}'"
              end
              @prog = xValue.to_s
            when "file"
              warn ":file option is deprecated, please use :<format> => :<file>"
              @filename = xValue.to_s
            when "parent"
              @oParentGraph = xValue
            when "type"
              if GRAPHTYPE.index( xValue.to_s ).nil? == true
                raise ArgumentError, "graph type '#{xValue}' unknow"
              end
              @oGraphType = xValue.to_s
            when "path"
              @path = xValue.split( "," ).map{ |x| x.strip }
            when "strict"
              @strict = (xValue ? true : false)
            when "errors"
              @errors = xValue
            when "extlibs"
              @extlibs = xValue.split( "," ).map{ |x| x.strip }
            else
              self[xKey.to_s] = xValue.to_s
          end
        end

        yield( self ) if( block )
      end