[xsl] xsl:key problem (probably!)

[roland_lechner@xxxxxx]

Hi,

I got the following code:

...
<xsl:key name = "accountvalue"  match ="/STATEMENT_OF_CHANGE/ACCOUNT_VALUES/ACCOUNT_VALUE" use = "ACCOUNT_NUMBER" />
...

and then I call the key() function like this:
...
 <xsl:variable name="accnr" select="@account_number" />
            <xsl:variable name="accv" select="key('accountvalue', $accnr)" />
 			<!--<xsl:value-of 
 			<xsl:value-of select="$accv/VALUE[@currency='LW']" />
...

This works perfectly fine, when the "/STATEMENT_OF_CHANGE/ACCOUNT_VALUES/ACCOUNT_VALUE" node exists.
If it doesn't XALAN 2.0 throws a NullPointerException (in the value-of statement!)

I tried to test the existence of then node, using things like:

<xsl:if test="$accv">
or
<xsl:if test="$accv/VALUE">.
(Here you also get some type of exception...)

Is this noraml, a bug or is it just me not knowing what do to?

Thanks in advance!

Roland
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