making calculations in XSL

Hello.

I'm sorry if u think of my question to be a incredibly newbie-like.

The thing is that I was told that it is possible to make sums in XSL (i.e.
adding the value of an element to another value of an element)

Suppose I have the following xml

<?xml version="1.0">
<startmeup>
<number>1</number>
<number>2</number>
<number>...</number>
.
.
.
</startmeup>

What I need is to sum the numbers: 1 + 2 + all the following values of the
<number></number>. I've been trying to get it to work but I can't. I've been
using the sum() thing, but as i said before it's not adding.

Can somebody help me please?

thanx in advance.
.romina.


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