[WiX-users] Unable to use Xpath expressions

[Pan.Pantziarka]

Hi,

I'm new to Wix 3.0 and am trying to use it to insert new elements into a config 
XML file. The format of the file is something like this:

<stuffs>
   <stuff>
    <name>first stuff</name>
  </stuff>
  <stuff>
    <name>more stuff</name>
  </stuff>
</stuffs>

I want to add another stuff element to the end of the file and am trying to use 
XMLFile as follows:

    <DirectoryRef Id="ConfigXML">
      <Component Id="XMLFile" Guid="My-GUID">
        <File Id="SettingsXmlFile" Name="config.xml" 
Source="c:\path\to\xmlfile\config.xml" DiskId="1" Vital="yes" />
          <util:XmlFile Id="AddStuff" Action="createElement" 
ElementPath="/stuffs" Name="stuff"
              File="c:\path\to\xmlfile\config.xml " Sequence="1"/>
          <util:XmlFile Id="AddStuffName" Action="createElement" 
ElementPath="/stuffs/stuff[\[]last()[\]]" Name="name" Value="new stuff"
              File=" c:\path\to\xmlfile\config.xml " Sequence="2"/>
      </Component>
    </DirectoryRef>

I've tried escaping and not escaping the Xpath expression to get the last stuff 
element, which is the last one added, but all I get are errors. I've tried all 
sorts of kludges to reference the new stuff element but to no avail. This is 
with the 3.0.5419.0 build of WiX 3.0. I can't get any xpath expression to 
resolve at all...

What am I doing wrong?

Thanks




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