unix problems

Hello People,
I had already posted this problem before, but  this time i see it is
behaving all the more strange.

Xsl Variable declaration like...

<xsl:variable name="isCorrectValue">
    <xsl:if test="not(string-length($demoValue/value = 'valid')=0)">
      <xsl:text>yes</xsl:text>
     </xsl:if>
    </xsl:variable>
Works fine with Win2k but fails in UNIX.
Can anyone please help me.This is recurring problem of concern
Thanks





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