[Bug]: "featured" attribute on JSON-LD for communities is not part of any of the included context documents.

[lullis]

Requirements

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Summary

Communities provide the information about pinned posts as a collection in the "featured" field. E.g, https://lemmy.example/c/linked-data which stores the list of pinned posts at https://lemmy.example/c/linked-data/featured.

The "featured" attribute is commonly used by other software via the join-mastodon context (toot:featured), but the mastodon namespace is not included in lemmy's context document, so any attempt at parsing JSON-LD data leads to "featured" becoming a "blank node".

In effect, this makes software that depends on RDF to read and process documents generated by lemmy incomplete.

Steps to Reproduce

1.Take the JSON-LD from any community url and paste it on https://json-ld.org/playground/, e.g, https://lemmy.world/c/nba
2.Look at the "expanded" tab and look for the "featured" key, compare with the followers key.

_:featured": [
      {
        "@value": "https://lemmy.world/c/nba/featured"
      }
    ],
    "https://www.w3.org/ns/activitystreams#followers": [
      {
        "@id": "https://lemmy.world/c/nba/followers"
      }

Technical Details

You can fix this by either including the mastodon context url on your document, or by redefining the featured attribute on your lemmy namespace. In any case, I've seen in other threads that you are not claiming to support json-ld, but I'd ask you to reconsider this. RDF and JSON-LD might seem like superfluous overhead, but once you get past the initial learning curve it can make the development of truly independent and decenralized web, easier, faster and richer in functionality.

Version

0.19.13

Lemmy Instance URL

No response

[Nutomic]

Lemmy itself doesnt parse the context at all, so for us it doesnt really matter. However youre welcome to make a pull request to this file to fix any problems you encounter.