wrong activitystreams namespace in activitystreams2 ontology

[phtyson]

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In activitystreams2.owl:

1. change @prefix as: <http://www.w3.org/ns/activitystreams#> . to @prefix as: <https://www.w3.org/ns/activitystreams#> .. (Activity Vocabulary)
2. remove unneeded empty prefix
3. remove unneeded @base directive

I have updated this in my fork, will submit pull request soon.

The ontology URI is <http://www.w3.org/ns/activitystreams#> but I will defer to project leads whether to change that.

[csarven]

I suggest closing this issue to keep discussion around it to minimal. There had been other issues already on this. It is potentially resolved by https://github.com/w3c/activitystreams/pull/504 . See also https://github.com/w3c/activitystreams/issues/416#issuecomment-1847543536

[phtyson]

Closed as duplicate of #504