Variable confusion

Hi,

First post to this list so please be kind!

I have a stylesheet with a global variable, the value of which is taken from
the input source.
It seems the first time I run a transform the variable is set correctly but
on subsequent transforms it is not and it retains it's first value.

The stylesheet starts like this...

<?xml version="1.0"?>
<!DOCTYPE storpres [<!ENTITY pound "&#163;"><!ENTITY space "&#160;">]>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" indent="yes" encoding="UTF-8"/>

<xsl:variable name="pageNum" select="/storpres/est/general/trans-page"/>
<xsl:variable name="transactions-per-page">20</xsl:variable>
...

The first time I perform a transform the /storpres/est/general/trans-page is
1 and this is what is in $pageNum
The second time I run the transform the input xml is changed so
/storpres/est/general/trans-page is 2 but $pageNum is still 1?

to prove it, later in the stylesheet I have...

alert('pageNum='+<xsl:value-of select="$pageNum"/>+
         ' trans-page='+<xsl:value-of
select="storpres/est/general/trans-page"/>);

This tells me pageNum=1 but trans-page=2.

I understand xsl:variable is immutable within the stylesheet but not why I
can't change its value for subsequent transforms.
Has anyone any ideas why this is happening?

---
regards 
Tim Tompkins



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