help need with template toolkit process

Hi everyone,
I have one xml data and I through XML::simple then i stored in a string and
processing using template. but my problem is I have some repeated nodes in
xml data suppose university name is repeated then no need to process . how
can i do with template if  if same name occurs twice then font process that
one like that. I am converting xml data into pdf so same data occurring two
times so i need to overcome this problem.
<university>
<name>svu</name>
 <location>ravru</location>
 <branch>
   <electronics>
     <student name="xxx" number="12">
     <semester number="1"subjects="7" rank="2"/>
     </student>
     <student name="xxx" number="15">
     <semester number="1" subjects="7" rank="10"/>
     <semester number="2" subjects="4" rank="1"/>
      </student>
       <student name="xxx" number="16">
       <semester number="1"subjects="7" rank="2"/>
      <semester number="2"subjects="4" rank="2"/>
       </student>
    </electronics>
 </branch>
 </university>
 <university>
 <name>sku</name>
  <location>ANTP</location>
   <branch>
     <electronics>
       <student name="xxx" number="12">
     <semester number="3"subjects="6" rank="20"/>
        </section>
    </electronics>
  </branch>
 </university>

I used XML::Simple to store this data into one hash data structure variable
$data and that information is like this

$var1={
        'university'=>{
           'name'=>'svu',
           'location'=>'ravru',
            'branch'=>{
                     'electronics'=>{
                                'student'=>[
                                         {
                                        'name'=>'mikky',
                                         'number'=>'12',
                                           'semester'=>{
                                                  'Number'=>'1',
                                                  'subjects'=>'7',
                                                   'rank'=>'1'
                                                  }
                                               },
                                       {
                                        'name'=>'vijju',
                                         'number'=>'15',
                                           'semester'=>[
                                                {
                                               'number'=>'1',
                                                'subjects'=>'3',
                                                 'rank'=>'10'
                                                  },
                                                 {
                                                'number'=>'1',
                                                'subjects'=>'2',
                                                 'rank'=>'1'
                                                  }
                                                 ]
                                               },
                                            ]
                                          }
                                         }
                                       };

             'name'=>'sku',
             'location'=>'ANTP',
            'branch'=>{
               'electronics'=>{
                          'student'=>[
                                     {
                                     'name'=>'shyam',
                                     'number'=>'12',
                                       'semester'=>{
                                                'Number'=>'3',
                                                'subjects'=>'5',
                                                'rank'=>'20'
                                                  }
                                               },

                                             ]
                                           }

                                         }
                                       };

I written some script using template toolkit to genarate pdf file using
pdflatex compiler.

[% FOREACH st IN university %]
[% st.name %]
[%st.location%]
studentdata:
[% FOREACH student IN st.branch.electronics.student %]
Component type: [%+ student.name +%][%+ student.number +%]
       [% FOREACH semester IN student.semester %]
   [%+ semester.number +%]
   [%+ semester.subjects +%]
   [%+  semester.rank +%]
     [% END %]
 [% END %]
[% END %]
can any one help me how to remove duplicate data .

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