What I dislike about this is that the base for the references in the XML files is not the directory the XML file is located in. So there's some special knowledge needed to interpret the references. I suggest this structure intead:
Of course the gimp-help.xml file could also use absolute URLs so the help files don't absolutely need to be in the same directory and might even be online on some web-server.
This makes a whole lot more sense. I like it.
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