gtk-doc versus doxygen

Are there any gnome policies against using doxygen for documenting
code?  gtk-doc does not seem to have many features, and I can't find
much documentation on the features it does offer.  doxygen, though, has
some great features, such as linking to the code, showing which
functions are referenced by others and what each function references.
So, if I'm hoping to have my project included in gnome cvs, or the gnome
desktop, do I need to use gtk-doc?  And where can I find some docs about
all the features offered?


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