Repeated Recursion on different parts of a tree

I am quite familiar with recursive processing in
XSL, and its use as a 'replacement' to variables that cant be 
redifined. However I have come across a problem
I cant seem to solve and was wondering if anyone could help me?

Basically I have the following XML code:

<register name="DATA" offset="0">
    <no_of_regs>1</no_of_regs>
    <descriptivename>Data register</descriptivename>
    <description>The ...ster.</description>
    <description>In ord..H.</description>
    <description>..Oe...</description>
    <bitfield name="DATA">
      <function>Input data.</function>
      <bitpos>0</bitpos>
      <no_of_bits>10</no_of_bits>
      <initialvalue>0</initialvalue>
      <accesstype>RW</accesstype>
    </bitfield>
    <bitfield name="Reserved">
      <function>Output data</function>
      <bitpos>10</bitpos>
      <no_of_bits>6</no_of_bits>
      <initialvalue>0</initialvalue>
      <accesstype>RW</accesstype>
    </bitfield>
etc..........

</register>

<register name="SWAP" offset="10">
    <no_of_regs..........



 It is used for a hardware project I am working on at university. I want to
do do some arithmetic and bitwise operations
on each bitfield <initialValue> element, and its <bitpos> element. 
(What I hope to achieve is -
using all of the bitfields correctly together to describe the whole
register in my output document)


Now I know recursively I can 'update a variable' with the bitfield
information I need. However, when traversing my XML, how can I keep a
record of what values I have processed
in the tree. For example If I have recursively called a template to
process <bitfield name="DATA">, when the template is recalled recursively,
how do I get it to now work on <bitfield name="Reserved">, and then the 
node after that etc ?

How would I keep track of the elements I have processed? 

Thankyou very much for your time

----------------------
Peter Doggett
ee99ppd@xxxxxxxxxxxx


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