sum function

Hi all,

I hope my problem was not posted 1000 times before...

I have a XML file like this:

<cashflow>
  <amount>10000</amount>
  <when>now</when>
</cashflow>
<cashflow>
  <amount>20000</amount>
  <when>Jan2001</when>
</cashflow>
<cashflow>
  <amount>30000</amount>
  <when>now</when>
</cashflow>
<cashflow>
  <amount>10000</amount>
  <when>Feb2001</when>
</cashflow>

I need to sum all <amount> fields where //cashflow/when='now'.

Can anybody give me a hint on this?

Thanks in advance
Ralf




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