[Tools-discuss] [ABNF] Legal or not legal to have literal numbers?

[Stephane Bortzmeyer <bortzmeyer at nic.fr>]

The attached grammar, extracted from
draft-greifenberg-mmusic-img-urn-02, is accepted by half of the ABNF
checking tools and refused by the other half.

The controversial issue is:

MM             = ( 0 DIGIT )
                   ^
                   Literal number

I believe it is not authorized by RFC 4234. Among the programs:

* Jutta Degener's abnfgen accepts it,
* Bill Fenner's ABNF Parser refuses it,
* my Eustathius program refuses it,
* ABNF Validator accepts it.

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