I found the solution:

XML file:
<?xml version="1.0"?>
<dpInst>
  <search>
    <subDirectory>DirOne</subDirectory>
    <subDirectory>DirTwo</subDirectory>
  </search>
  <suppressAddRemovePrograms/>
  <quietInstall/>
</dpInst>

To remove the line
    <subDirectory>DirTwo</subDirectory>
you need to write the XMLConfig in following way:

    <File Id='XmlSettings' Name='dpinst.xml' DiskId='1' />
    <XmlConfig Id='RemoveOneLine'
           File='[#XmlSettings]  '
           Action='delete'
           ElementPath='//dpInst/search'
           VerifyPath='subDirectory[/[].="DirTwo"[/]]'
           Node='element'
           On='install'
           Sequence='1' />

Hope that it will help somebody...

Stefan


-- 
Stefan Pavlik | [EMAIL PROTECTED]
Whitestein Technologies s.r.o. | www.whitestein.com
Panenska 28 | 811 03 Bratislava | Slovak Republic
Main +421 2 5443-5502 | Direct +421 2 5930-0735

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