Hi all,

with REUSE 3.2¹ out the door, there is another thing that has been baffling me 
for some time when it comes to SPDX File Tags².

When tagging source code files with SPDX tags, it may be useful to also 
designate the correct origin/provenance – either so your origin travels with 
your code, or if you pulled a file or snippet from elsewhere, but want to 
store its origin.

There are three problems I see:

1. File Tags are limited to File-level tags:
> The meaning and semantics of any SPDX file tag are intended to be identical 
> to those described in the File Information (Clause 8) section of the SPDX 
> specification.
while the External Repository Identifiers³ are referred to on Package-level⁴. 
There used to be `ArtifactOf[…]` tags that were used on a File-level, but 
these have been deprpcated in favour of the External Repository Identifiers.

2. `ExternalRef` tags get quite long and unwieldy, definitely not something 
easy to write by hand. If I understand correctly, this would look something 
like:
`SPDX-PackageExternalRef PERSISTENT-ID swh swh:1:cnt:
94a9ed024d3859793618152ea559a168bbcbb5e2`
`SPDX-PackageExteralRef PACKAGE-MANAGER purl pkg:gem/ruby-advisory-db-
[email protected]`

3. There are potentially also `PackageOriginator`, `PackageSupplier` and 
`PackageDownloadLocation` tags. Technically PURL is an URL, so it would fit 
here, but that is not what the spec says.

I know everyone’s busy with SPDX 3.0, but REUSE / File Tags are out there and 
very useful, so I would like to keep them being useful.


cheers,
Matija
—
1       https://reuse.software/spec-3.2/
2       https://spdx.github.io/spdx-spec/v2.3/file-tags/
3       https://spdx.github.io/spdx-spec/v2.3/external-repository-identifiers/
4       
https://spdx.github.io/spdx-spec/v2.3/package-information/#721-external-reference-field
-- 
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