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<a name="Level-BNF"></a>
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<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">&lt;debug-spec&gt; ::= &lt;level-spec&gt; | &lt;debug-level-list&gt;
&lt;debug-level-list&gt; ::= &lt;debug-level&gt; |
                       &lt;debug-level-list&gt; &quot;;&quot; &lt;debug-level&gt;
&lt;debug-level&gt; ::= &lt;category&gt; | &quot;!&quot; &lt;category&gt; |
                  &lt;category&gt; &quot;.&quot; &lt;level-list&gt;
&lt;level-list&gt; ::= &lt;level-spec&gt; | &lt;level-list&gt; &quot;,&quot; &lt;level-spec&gt;
&lt;level-spec&gt; ::=  &lt;level&gt; | &lt;negate-level&gt;
&lt;negate-level&gt; ::= &quot;!&quot; &lt;level&gt;
&lt;level&gt; ::= &lt;level-number&gt; | &quot;=&quot; &lt;level-number&gt; |
            &lt;level-number&gt; &quot;-&quot; &lt;level-number&gt;
&lt;level-number&gt; ::= &quot;error&quot; | &quot;trace0&quot; | &quot;trace1&quot; | &quot;trace2&quot; | &quot;trace3&quot; |
                   &quot;trace4&quot; | &quot;trace5&quot; | &quot;trace6&quot; | &quot;trace7&quot; |
                   &quot;trace8&quot; | &quot;trace9&quot; | &quot;prot&quot;
</pre></div>




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