moving from cocoon 2.1 dev to cocoon 2.1.3 dev

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We are moving our application from Cocoon 2.1 Dev to Cocoon 2.1.3 Dev.   One xsl statement that worked in Cocoon 2.1 dev causes error in Cocoon 2.1.3 Dev.   <xsl:if test="normalize-space(element_name) = normalize-space($variable_name)">    </xsl:if>   In the xsl-if , if I used normalize-space then the page fails with the following error:   The XML page cannot be displayed Cannot view XML input using style sheet. Please correct the error and then click the Refresh button, or try again later.   --------------------------------------------------------------------------------   XML document must have a top level element. Error processing resource     View source on browser displays empty page.   If I removed the normalize-space, then the page works ok  ie. <xsl:if test="element_name = $variable_name">    </xsl:if>   As far as I know, xsl syntax is ok. Any tips are welcome.