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    #!/usr/bin/perl
    use warnings;
...
        [%st.testinfo.humidity %]
        [% END %]
       \end{document}

    $var1={
            <test>1<test>'=>'<testinfo>
...
                               <humidity="75"/>
                                </testinfo>........so many tests
                }

    testnumber= 1,
      testinfo: temperature= "23",
...
                   humidity="75"