index (REXML::Elements)

    # File temp/element.rb, line 851
                    def index element
                            rv = 0
                            found = @element.find do |child|
                                    child.kind_of? Element and
                                    (rv += 1) and
                                    child == element
                            end
                            return rv if found == element
                            return -1
                    end