How to process response in mule ESB - mule-studio

Question

I am trying to write data weave to add the price in the response xml.
Request xml looks like
<?xml version="1.0" encoding="UTF-8"?>
<UniversityResponse xmlns="urn:abc:api:Components">
<Timestamp>2015-12-16T22:05:41.229Z</Timestamp>
<Dept>IT</Dept>
<Fees>
<Fee>
<Name>John</Name>
<Fee currencyID="USD">1.0</Fee>
</Fee>
<Fee>
<Name>Enrique</Name>
<Fee currencyID="USD">3.0</Fee>
</Fee>
<Fee>
<Name>Mary</Name>
<Fee currencyID="USD">2.0</Fee>
</Fee>
<Fee>
<Name>Meena</Name>
<Fee currencyID="USD">0.5</Fee>
</Fee>
</Fees>
</UniversityResponse>
As of now i wrote like
%dw 1.0
%namespace ns0 urn:abc:api:Components
%output application/xml
---
TotalFees:{
plus : payload.ns0#UniversityResponse.ns0#Fees.*ns0#Fee[0].ns0#Fee +
payload.ns0#UniversityResponse.ns0#Fees.*ns0#Fee[0].ns0#Fee +
payload.ns0#UniversityResponse.ns0#Fees.*ns0#Fee[1].ns0#Fee +
payload.ns0#UniversityResponse.ns0#Fees.*ns0#Fee[2].ns0#Fee +
payload.ns0#UniversityResponse.ns0#Fees.*ns0#Fee[3].ns0#Fee
}
Output :
<TotalFees>
<plus>6.5</plus>
</TotalFees>
How Can i loop the complex tag in the response xml ?
Basically i want to create one loop for UniversityResponse/Fees. Inside the loop i want to write something like Plus = Plus + "UniversityResponse/Fees/Fee[counter].Fee"

Answer 1

That was kind of a headbreaker because i was looking for a SUM function in the docs, not in the docs but it is in the language :)
--
%dw 1.0
%output application/xml
%namespace ns0 urn:abc:api:Components
---
TotalFees: plus: sum payload.ns0#UniversityResponse.ns0#Fees.*ns0#Fee.ns0#Fee
<?xml version='1.0' encoding='UTF-8'?>
<TotalFees>
<plus>6.5</plus>
</TotalFees>