def bold
         style      = CharacterStyle.new
         style.bold = true
         if block_given?
            apply(style) {|node| yield node}
         else
            apply(style)
         end
      end
def bold
         style      = CharacterStyle.new
         style.bold = true
         if block_given?
            apply(style) {|node| yield node}
         else
            apply(style)
         end
      end
This method provides a short cut means of creating a bold command node.
 The method accepts a block that will be passed a single parameter which
 will be a reference to the bold node created. After the block is
 complete the bold node is appended to the end of the child nodes on
 the object that the method is call against.