Problem writing a XSLT stylesheet

Hello ,

I have a XML file as below.

XML file
---------
<rootelem>
<TAG>
  <A>dfdf</A>
  <B>gfgfgg</B>
  <C>ytyty</C>
  <D>ghghgh</D>
  <E>ghghgh</E>
</TAG>
<TAG>
  <C>ytyty</C>
  <D>ghghgh</D>
  <E>ghghgh</E>
</TAG>
<TAG>
  <B>ghgh</B>
  <C>ytyty</C>
  <D>ghghgh</D>
  <E>ghghgh</E>
</TAG>
<TAG>
  <C>ytyty</C>
  <D>ghghgh</D>
  <E>ghghgh</E>
</TAG>
<!..TAG can repeat any no of times -->
</rootelem>


There are certain tags missing in <TAG>. The missing
tags <A> and <B> are repetitive information. Therefore
the first <TAG> tag will have data and will not be
present in tags after that unless there is a change in
these tag's value. 

The <A> tag can have 3 possible values
value1, value2, value3

Based on this value, the label for <E> that needs to
be output will change --
if <A> is value1, output E's label as Label1
if <A> is value2, output E's label as Label2
if <A> is value3, output E's label as Label3


I want the output to appear as

Label1  <value-of E>
Label3  <value-of E>
Label2  <value-of E>
..etc
(the Labels will be different depending on the value
of <A>)

I am trying to do this in XSLT but am facing problem
in doing so. I tried using a variable for E's Label
and assigning it Label value depending on <A> but this
was not possible as A is sent in XML tag for the first
time and thereafter it is not present in XML file
until a new A is to be displayed. 

Can anybody please help?

Regards,
Mukul

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