<prog>
  <l_dec>
    <varDec>$a</varDec>
  </l_dec>
  <l_dec>
    <foncDec>
      procedure
      <l_instr>
        <instr_ecrire>
          <intExp>1</intExp>
        </instr_ecrire>
      </l_instr>
    </foncDec>
    <l_dec>
      <foncDec>
        main
        <l_instr>
          <instr_appel>
            <appel>
              procedure
              <l_exp>
              </l_exp>
            </appel>
          </instr_appel>
        </l_instr>
      </foncDec>
    </l_dec>
  </l_dec>
</prog>
