SPDX 3.0 will (if I understand the situation correctly) support an
`AdditionRef-` construct - see:
https://github.com/spdx/spdx-spec/issues/153

On Sun, Sep 24, 2023 at 9:29 PM Peter Monks <[email protected]> wrote:
>
> G'day everyone,
>
> I developed an SPDX expression parser, based on the ABNF grammar in annex D 
> of version 2.3 of the SPDX specification, and I recently came across an 
> unusual case that gave me pause.  Basically someone had put a LicenseRef in 
> the exception-identifier position:
>
> GPL-3.0-or-later WITH LicenseRef-Additional-Permission
>
> Now clearly this is not a valid expression according to the ABNF, but I 
> wondered if perhaps it, or something like it, should be, or (alternatively) 
> if there's a good reason it's not allowed?
>
> Thanks in advance for any insights,
> Peter
>
> 



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