Re: Should the specs be forked and maintained elsewhere?

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> > > 2) additional guidance or mechanisms were given to the community to extend AS2 via JSON-LD without having their own "vendor", or doing so in a "vendor-independent" way
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Hm, I am not sure if I understand "vendor-independent" properly

Just wanted to tell a story from Christmas until last week and some conclusions: 
TL;DR – [spoiler] `Relationship`

In Germany, the “cab facilities” (official cooperative taxi, bike cooperative Riksha service) will start to share their locations with the dispatch which is together with drivers and local users on an instance.
We want to recontribute to wikidata and OpenStreetMap.
Similar to inventaire.io and Max, I work on a model to bridge wikibase (incl. wikidata) and ActivityPub.
So, in December we started to make an Atlas for 1.9 million well known places.
It is a hierarchical Collection of the Planets locations with boundaries and data, all mapped from e.g. OpenStreetMap, wikidata, eurostat, destatis etc. 
This was done with a full OSM Planet DB and a wikidata to ActivityVocabulary Proxy.

The proxy can decide which ActivityPub's main `type` the item is (here: `Place`) based on the wikidata P31.
It _has_ a JSON-LD context for doing this for each type.
It adds P31/*P279 from wikidata and same from OSM so we have like "type": ["Place", "redaktor:Factual", "redaktor:ADM1", "wkd:Q1637706"] 
This is vendor specific incl. the most popular properties but we map as much possible to AS …

But in wikipedia “everything is a claim” – and how to include the wikidata “qualified statements”? 
The answer to me would be: `Relationship` https://www.w3.org/TR/activitystreams-vocabulary/#connections 
For example Commons are translated to AS, e.g. as `Image` https://upload.wikimedia.org/wikipedia/commons/4/4b/Hambourg_banner.jpg 
with id "foo"
We can say `https://www.wikidata.org/wiki/Q1055 (Hamburg)` `https://www.wikidata.org/wiki/Property:P948 (page banner)` `foo`
Then we can write `https://www.wikidata.org/wiki/Q1055 (Hamburg)` `https://www.wikidata.org/wiki/Property:P1082 (had a population of)` 
20181,841,179 `startTime` 31. 10. 2019 (as date) `endTime` 31. 12. 2019 (as date) and the Relation's author is the claims author.
Also you do not need to update the whole object, just the relation …