[xsl] determine if a value exist in the following-sibling

Hi,

please anyone can help me with this expression,

i got the following xml :
<amounts>
        <period_id>1</period_id>
        <value>1</value>
</amounts>
<amounts>
        <period_id>2</period_id>
        <value></value>
</amounts>

in my code i have <xsl:for-each select="amounts">  

and i want to test if the next elements of amounts have a "value" or not,
i'm using xslt 1.0 with xalan/apache fop.

NB: i tried with the following:boolean(following-sibling::amount/text())
but the expression is wrong ....

and thanks a lot for you help

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