d_o_s( p, ns, r ) private

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# File lib/rexml/xpath_parser.rb, line 476
    def d_o_s( p, ns, r )
      nt = nil
      ns.each_index do |i|
        n = ns[i]
        x = expr( p.dclone, [ n ] )
        nt = n.node_type
        d_o_s( p, n.children, x ) if nt == :element or nt == :document and n.children.size > 0
        r.concat(x) if x.size > 0
      end
    end
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