The TREE profile spec

[pietercolpaert]

See #118

[pietercolpaert]

During the call of 2025-04-02:

• @smessie proposed to also add support for having relations at the end of the page.

We will not merge this PR just yet, and await merging it until the feature has been added.

[pietercolpaert]

We probably also want to mention it from the MEA section in the spec as well in this PR.

[pietercolpaert]

I also wonder whether we need to allow for a non HTTP header method for discovering the fact the profile was used. E.g., should we allow detecting it from the fact the URL contains .tree.ttl?

[pietercolpaert]

TODO for this PR

• Allow for tree:Relations at the end of the file
• Mention this profile in the section on the Member Extraction Algorithm in the main spec
• Discuss file extension as a fallback to the header option

[smessie]

I also wonder whether we need to allow for a non HTTP header method for discovering the fact the profile was used. E.g., should we allow detecting it from the fact the URL contains .tree.ttl?

I wouldn't make such extension mandatory, but I like the idea to not have to rely on solely an HTTP header. Would again be beneficial in those cases where the publisher has no influence in the headers being set.