[xsl] Add numbers

Hi,

I have an XML: 

<?xml version="1.0" encoding="UTF-8"?>
<first>
    <second>
        <a val="4" key="one">b</a>
        <a val="2" key="two">b</a>
    </second>
    <second>
        <a val="3" key="one">c</a>
    </second>
</first>

I need to group together the nodes which have the same key and then I
need to add the attribute "val" in all such cases. 

So, The output I need is:

<op>
        <one>
                <val>7</val>
        </one>
        <two>
                <val>2</val>
        </two>
</op>

How do I go about doing this? I am using Xalan and XSLT 1.0.

I have used the Meunichian method to group the nodes with same keys
together. But I don't know how to proceed from there. I tried using the
sum() function but it won't work for me on account that even if I run a
for-each loop over the set of nodes with the same key, it just prints
out the value of "val" for each a element. I think I need to be in the
parent element for this to work.  

Thanks,
Harsh.

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