d="ftn.spirit.abstracts.parsing_expression_grammar.f1" class="footnote"><p><a href="#spirit.abstracts.parsing_expression_grammar.f1" class="para"><sup class="para">[7] </sup></a>
          Richard E. Pattis: EBNF: A Notation to Describe Syntax, <a href="http://www.cs.cmu.edu/~pattis/misc/ebnf.pdf" target="_top">http://www.cs.cmu.edu/~pattis/misc/ebnf.pdf</a>
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