OR expr with node sets

Hi,

i want do something if node
dok/zonen/textsuche/jpk/jpk-titel/div/normfassungen exists 
                 or if node
dok/notindexed/jpk/jpk-titel/div/normfassungen exists

But the following xsl:if
<xsl:if test="dok/zonen/textsuche/jpk/jpk-titel/div/normfassungen |
dok/notindexed/jpk/jpk-titel/div/normfassungen">

produces
        java.lang.StringIndexOutOfBoundsException: String index out of
range: -6
using XALAN 2.6.0

What is wrong with the above "or" expr?

Regards,
Thomas.

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