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/usr/share/doc/gnuradio/README.doxyxml is in gnuradio 3.7.9.1-2ubuntu1.

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The actual contents of the file can be viewed below.

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The process of updating and exporting the Doxygen document strings
into Python consists of a few steps.

1. Make sure the 'docs' component will be built, which requires
Doxygen.

2. Build the project like normal, which will run Doxygen and store the
   XML files into $(top_builddir).

3. In $(top_srcdir)/docs/doxygen, run the command:

   $ python swig_doc.py \
     	    $(top_builddir)/docstrings/docs/doxygen/xml \
     	    $(top_srcdir)/gnuradio-runtime/swig/swig_doc.i

   This uses the XML output of Doxygen to to rebuild a SWIG file that
   contains all of the current Doxygen markups.

4. Rebuild the GNU Radio libraries. Since gnuradio.i is included in
   all of the GNU Radio components, and gnuradio.i includes
   swig_doc.i, when the libraries are rebuilt, they will now include
   the documentation strings in Python.

5. Install GNU Radio. Now, when you run help() in Python on a GNU
   Radio block, you will get the full documentation.