incorrect use of xsl:key cause NullPointerException 
----------------------------------------------------

         Key: XALANJ-2108
         URL: http://issues.apache.org/jira/browse/XALANJ-2108
     Project: XalanJ2
        Type: Bug
  Components: XSLTC  
    Versions: 2.6    
 Environment: windows jdk 1.42.06
    Reporter: arn44
    Priority: Minor


my stylesheet 
-------------
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
        <xsl:output method = "html" encoding="iso-8859-1" />
        
        <xsl:variable name = "x" select = "'1'" />
        <xsl:variable name = "y" select = "'4'" />
        <xsl:key name = "key_test"  match ="test" use = "substring(date, $x, 
$y)" />
        
        <xsl:template match="/">        

        </xsl:template>
</xsl:stylesheet>

xml file
<test><date>2004-01-01</date></test>


java.lang.NullPointerException
        at 
java.lang.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:980)
        at java.lang.Double.valueOf(Double.java:202)
        at 
org.apache.xalan.xsltc.runtime.BasisLibrary.stringToReal(BasisLibrary.java:838)
        at ent_recherche_simple.buildKeys()
        at ent_recherche_simple.transform()
        at 
org.apache.xalan.xsltc.runtime.AbstractTranslet.transform(AbstractTranslet.java:580)

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