step

# File lib/rexml/xpath_parser.rb, line 429
    def step(path_stack, any_type: :element, order: :forward)
      nodesets = yield
      begin
        # enter(:step, path_stack, nodesets)
        nodesets = node_test(path_stack, nodesets, any_type: any_type)
        while path_stack[0] == :predicate
          path_stack.shift # :predicate
          predicate_expression = path_stack.shift.dclone
          nodesets = evaluate_predicate(predicate_expression, nodesets)
        end
        if nodesets.size == 1
          ordered_nodeset = nodesets[0]
        else
          raw_nodes = []
          nodesets.each do |nodeset|
            nodeset.each do |node|
              if node.respond_to?(:raw_node)
                raw_nodes << node.raw_node
              else
                raw_nodes << node
              end
            end
          end
          ordered_nodeset = sort(raw_nodes, order)
        end
        new_nodeset = []
        ordered_nodeset.each do |node|
          # TODO: Remove duplicated
          new_nodeset << XPathNode.new(node, position: new_nodeset.size + 1)
        end
        new_nodeset
      # ensure
      #   leave(:step, path_stack, new_nodeset)
      end
    end