# File proofreader.rb, line 113
    def order?(element, die=nil)
      die = @proofsheet.die(element.inherited_namespace, element.absolute_xpath) if not die
      validity = true  # default unordered, so valid
      if die
        if die.order and element.has_elements?
					order_how = die.order[0]
          order_has = die.order[1]
          # load childern element tag names into an array
          children = []
          element.elements.each do |child_element|
            children << child_element.name
          end
          # how do you want it?
          case order_how
          when 'tag'
            # remove adjacent duplicates
            packed_children = []
            children.each do |c|
              packed_children << c if packed_children.last != c
            end
            # remove non-intersecting children items
            same_children = packed_children
            diff = children - order_has
            diff.each do |d|
              same_children.delete(d)
            end
            # remove non-intersecting ordered items
            same_has = order_has.dup
            diff =  order_has - same_children
            diff.each do |d|
              same_has.delete(d)
            end
            # correct?
            if same_children != same_has
              validity = false
              error = "ORDER tag"
              @errors << [die.namespace, die.xpath, error]
            end
          when 'content-a..z'
            sorted_children = children.sort
            if not sorted_children == ordered_children
              validity = false
              error = "ORDER content-a..z"
              @errors << [die.namespace, die.xpath, error]
            end
          when 'content-z..a'
            sorted_children = children.sort.reverse
            if not sorted_children == ordered_children
              validity = false
              error = "ORDER content-z..a"
              @errors << [die.namespace, die.xpath, error]
            end
          end
				end
      end
      return validity
    end