The worst XML use I have ever seen are lists generated by Lazarus. Every list. For example in the project files you have:

    <RequiredPackages Count="5">
      <Item1>
        <PackageName Value="LazUtils"/>
      </Item1>
      <Item2>
        <PackageName Value="treelistviewpackage"/>
      </Item2>
      <Item3>
        <PackageName Value="internettools"/>
      </Item3>
      <Item4>
        <PackageName Value="LCLBase"/>
        <MinVersion Major="1" Release="1" Valid="True"/>
      </Item4>
      <Item5>
        <PackageName Value="LCL"/>
      </Item5>
    </RequiredPackages>