gt;`
for details.

If you want to use some substitutions for all documents, put them into
:confval:`rst_prolog` or put them into a separate file and include it into all
documents you want to use them in, using the :rst:dir:`include` directive.  (Be
sure to give the include file a file name extension differing from that of other
source files, to avoid Sphinx finding it as a standalone document.)

Sphinx defines some default substitutions, see :ref:`default-substitutions`.


Comments
--------

Every explicit 