RFC 2156:MIXER (Mime Internet X.400 Enhanced Relay...
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ALPHA

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3. Basic Mappings
... definition = identifier / context identifier = ALPHA *< ALPHA or DIGIT or "-" > ...
... identifier / context identifier = ALPHA *< ALPHA or DIGIT or "-" > context ...


4. Addressing and Message IDs
... given = 2*<ps-char not including "."> initial = ALPHA surname = printablestring ...
... domain-syntax = alphanum [ *alphanumhyphen alphanum ] alphanum = <ALPHA or DIGIT> alphanumhyphen = <ALPHA ...
... ALPHA or DIGIT> alphanumhyphen = <ALPHA or DIGIT or HYPHEN> ...


5. Detailed Mappings
... -Confidential" language = 2*ALPHA [ "(" language-description ")" ] language ...


10. Appendix E - BNF Summary
... given = 2*<ps-char not including "."> initial = ALPHA surname = printablestring ...
... language = 2*ALPHA [ "(" language-description ")" ] ...

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