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