[xsl] use contains() function on a node set in XPath 1.0

Hello,

My question is about XPath 1.0, not XSL, but I hope that I may still 
pose it here. The problem is, precisely, that I cannot use XSL because I 
am in a PHP context, using DOM to perform XPath queries on an XML document.
The situation is the following: I have <notion> elements that contain 
one <name> element and zero or more <translation> elements. I want to 
select them according to whether any of these child elements contains a 
certain string. I was hoping that it would be as easy as this:
//notion[contains(*, "string")]

But then I realized that the contains() function evaluates only the 
first node of the set of child elements. So how can I do what I want to 
do? Since I am using DOM, I have to remain within XPath 1.0.
Thanks in advance for your help!
Wolfhart
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