lass="footnote" name="spirit.abstracts.parsing_expression_grammar.f0"><sup class="footnote">[6]</sup></a> are a derivative of Extended Backus-Naur Form (EBNF) <a href="#ftn.spirit.abstracts.parsing_expression_grammar.f1" class="footnote" name="spirit.abstracts.parsing_expression_grammar.f1"><sup class="footnote">[7]</sup></a> with a different interpretation, designed to represent a recursive
        descent parser. A PEG can be directly represented as a recursive-descent
        parser.
      </p>
<p>
     