# File lib/html5/treebuilders/rexml.rb, line 128
        def initialize name, public_id, system_id
            super(name)
            if public_id
              @rxobj = ::REXML::DocType.new [name, ::REXML::DocType::PUBLIC, public_id, system_id]
            elsif system_id
              @rxobj = ::REXML::DocType.new [name, ::REXML::DocType::SYSTEM, nil, system_id]
            else
              @rxobj = ::REXML::DocType.new name
            end
        end