Simple addition seems a bit tricky in zope

  <dtml-call "REQUEST.set('CategoryTotal',0)">

  <dtml-in "tmp.propertyItems()">
     <dtml-let key="_['sequence-key']"
               counter="_.getitem(category+'Total')">  <--// Here i want to
concatenate the category from the value with the word total so that i can
lookup my declared variable in the namespace.
         <dtml-var expr="counter=counter+value">  <--// Here i tried to
increase the declared variable with the value.

Can someone help?


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