# File lib/graphviz.rb, line 95
  def add_node( xNodeName, hOpts = {} )
    @hoNodes[xNodeName] = GraphViz::Node::new( xNodeName, self )
    @hoNodes[xNodeName].index = @elements_order.size_of( "node" )
    
    unless hOpts.keys.include?(:label) or hOpts.keys.include?("label")
      hOpts[:label] = xNodeName
    end
      
    hOpts.each do |xKey, xValue|
      @hoNodes[xNodeName][xKey.to_s] = xValue
    end
    
    @elements_order.push( { 
      "type" => "node", 
      "name" => xNodeName,
      "value" => @hoNodes[xNodeName] 
    } )
    
    return( @hoNodes[xNodeName] )
  end