[xsl] question on filtering a one-to-many relationship

Hi all,

Just to make my use case clear I quickly came up with a simple example showing 
my use case.

I need to write a function that enables me to return all <person>'s  which have 
at least 1 child that MATCHES a specific search string.

          persons/person[matches(upper-case(children/child/name), 
upper-case($searchString))]

Above expression does not work as the matches can only handle a single string 
as input and not a sequence of names.  So I was wondering what would be an 
elegant way to solve this puzzler?

Kind regards,
Robby Pelssers


<persons>
  <person>
    <name>Robby</name>
        <children>
          <child>
            <name>Lindsey</name>
          <child>
          <child>
            <name>Valerie<name>
          </child>
        </children>
  <person>
  <person>
    <name>Audrey</name>
        <children>
          <child>
            <name>Linn</name>
          <child>
          <child>
            <name>Tamara<name>
          </child>
        </children>  
  </person>
</persons>

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