selecting text node where one of its parents...

Hi,

How can I select a text() node that has a parent (not a direct parent) 
which is a node named label which has an attribute title which equals
xxx?

For example:

<myxml>
  <label title="xxx">
    <tag1 color="#ffffff">
      my text
    </tag1>
  </label>
  <label>
    <tag2>
      more text
    </tag2>
  </label>
</myxml>

I want to create a template which replaces the text 'my text'.
Is there something like // to select one of the parents of a node?

Thanks,
Andrej


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