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The following specification in Backus-Naur form describes formally the Mailutils debug level:
<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"