How to change the value of a variable?

Hello,

Is it possible in xsl to change the value of a variable?
If yes, how to do so?
Here is what I would like to do:

<xsl:stylsheet ..... >

...

<xsl:variable name="var">default_value</xsl:variable>

...

<!-- var <- "another value" -->

...

</xsl:stylesheet>

By what code may i replace the comment?

Thanx,

Manu.
--
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