(a2ps.info)Inheriting

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7.6.4 Inheriting from Other Style Sheets
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It is possible to extend an existing style.  The syntax is:
     ancestors are
        ANCESTOR_1[, ANCESTOR_2...]
     end ancestors

where ANCESTOR1 etc.  are style sheet keys.

   For semantics, the rules are the following:
   - the ancestors are read in order;

   - the definition of the current style is read last;

   - it is always the last item read which wins (last defined alphabets,
     case sensitivity, keywords, operators and sequences).

   As an example, both 'C++' and 'Objective C' style sheets extend the
'C' style sheet:

     style "Objective C" is
     #[...]
     ancestors are
        c
     end ancestors
     #[...]
     end style

   To the biggest surprise of the author, mutually dependent style
sheets do work!