join (REXML::XPathParser)

    # File rexml/xpath_parser.rb, line 543
      def join( arg1, op, arg2=nil)
    			return nil unless arg1 and op
    			op, arg2 = arg2, op unless arg2
    			#rv = []
    			#arg1 = [arg1] unless arg1.kind_of? Array
    			arg2 = [arg2] unless arg2.kind_of? Array
    			if arg1.size == arg2.size
    				arg1.each_index { |ind| arg1[ind] = yield(arg1[ind], op, arg2[ind]) }
    			#elsif arg1.size < arg2.size
    				#arg2.each { |item| rv << yield(arg1[0], op, item) }
    			else
    				#puts "ARG1.size = #{arg1.size}, ARG2.size = #{arg2.size}" if DEBUG
    				#puts "ARG2 is #{puta arg2}" if DEBUG
    				arg1.collect! { |item| yield(item, op, arg2[0]) }
    			end
    			arg1
    		end