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<a name="Level-BNF"></a>
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<p>
Next: <a href="Debugging-Categories.html#Debugging-Categories" accesskey="n" rel="next">Debugging Categories</a>, Previous: <a href="Level-Syntax.html#Level-Syntax" accesskey="p" rel="prev">Level Syntax</a>, Up: <a href="debugging.html#debugging" accesskey="u" rel="up">debugging</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="BNF"></a>
<h4 class="subsection">2.3.2 BNF</h4>
<p>The following specification in Backus-Naur form describes formally the
Mailutils debug level:
</p>
<div class="example">
<pre class="example"><debug-spec> ::= <level-spec> | <debug-level-list>
<debug-level-list> ::= <debug-level> |
<debug-level-list> ";" <debug-level>
<debug-level> ::= <category> | "!" <category> |
<category> "." <level-list>
<level-list> ::= <level-spec> | <level-list> "," <level-spec>
<level-spec> ::= <level> | <negate-level>
<negate-level> ::= "!" <level>
<level> ::= <level-number> | "=" <level-number> |
<level-number> "-" <level-number>
<level-number> ::= "error" | "trace0" | "trace1" | "trace2" | "trace3" |
"trace4" | "trace5" | "trace6" | "trace7" |
"trace8" | "trace9" | "prot"
</pre></div>
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