Re: Transitive and IntransitiveActivity

On 09/12/23 18:49, nightpool wrote:
> I think that, unless there's something I'm forgetting, it's pretty 
> reasonable to assume that all current specified AP vocabulary types 
> are transitive unless marked intransitive, but it would not be 
> possible to assume the same for extension types, since you're not 
> going to necessarily know at the time of processing whether an 
> extension type is intended to be Intransitive or not.
>
> And yes, regardless of whether an activity type is transitive or 
> Intransitive, no object property is *explicitly* required. 
> ActivityStreams is designed as a very flexible set of vocabulary for 
> social web concepts, it's designed so that other protocols (Like 
> ActivityPub, but also others) can add more requirements about what 
> properties may be required in different contexts to enable different 
> types of processing
>
>
>  (It's certainly reasonable to assume that, in the ActivityPub inbox 
> context, if you get a Like with no "object" property, there just isn't 
> anything useful for you to be able to do with it. But that may not 
> apply to all contexts—you could imagine a social web spec with an 
> "object inbox" where a Like's object could be inferred from the 
> receiver, for example)
Yes I think it is what I mean. With the open world assumption saying 
that a class has a mandatory property does not force anyone to state the 
property explicitly, but this would let a reasoner to assume that all 
the individuals in this class have the property (may be with an unknown 
value).
>
> On Sat, Dec 9, 2023, 11:05 AM Evan Prodromou <evan@prodromou.name> wrote:
>
>     No, the 'object' property is not mandatory.
>
>     No property is mandatory; an empty JSON object is compliant AS2.
>
>     'object' is just not meaningful for a type like 'Arrive'.
>
>     Evan
>
Ok thank you very much. We can just assume that intransitive activities 
has no object.

CL

>
>     On Dec 9, 2023 08:44, Cristiano Longo
>     <cristianolongo@opendatahacklab.org> wrote:
>
>         In
>         https://www.w3.org/TR/activitystreams-core/#intransitiveactivities
>         I
>         read that "IntransitiveActivity objects do not have an object
>         property.". In contrast, one should assume that the object
>         property is
>         mandatory for activities which are not in the
>         IntransitiveActivity?
>         I.e., all the activities which does not are in this class
>         should be
>         considerd "transitive"?
>
>         Thanks in advance,
>
>         CL
>
>
>