[Standards] Re: Remove requirement to send disco#info feature in XEP-0030

As others have said, it's a wart. Any protocol has lots of them; XMPP has always had its fair share. (You mention XEP-0045 briefly, and we're all familiar that it's essentially a collection of warts at this stage). This one is not, as far as I can see, harmful in any meaningful way. As Tedd Sterr notes, removing the reporting of disco#info support via disco#info might leave no features at all, which might - small chance - mean that implementations hit bugs. I see no benefit to interoperability to remove it at this time. However, I could see the benefit of adding a note to the effect of: "Some entities are known not to advertise the "http://jabber.org/protocol/disco#info" feature within their responses, contrary to this specification. Entities receiving otherwise valid responses which do not include this feature SHOULD infer the support." Dave. On Sun, 10 Mar 2024 at 16:27, Jonas Schäfer &lt;jonas(a)wielicki.name&gt; wrote: >Dear community, > >it's been a while I spoke up here. > >I would like to discuss the removal of the following part-sentence >from >XEP-0030 (in Final status!): > > > every entity MUST support at least the > > 'http://jabber.org/protocol/disco#info' feature > >Announcing that feature is redundant: An entity which replies with a >properly >constructed `<query xmlns="http://jabber.org/protocol/disco#info"/>` >element >is bound to (and has always been bound to) have implemented XEP-0030 >to the >best of its knowledge. > >As this is a Final(!) status XEP, here is my estimate of the impact >this >change has: > >- Implementations which required the presence of this feature on the > receiving side would now become non-compliant: They might assume > that the remote entity did not really support XEP-0030 and fail with > an error. > > Such implementations would need to be adapted in order to be able to > interoperate with implementations which follow a revised version of > XEP-0030. > >I don't see any other impact. I also strongly suspect that the set of >implementations which follow XEP-0030 to the letter is rather slim (I >only >know of a single one, which would be the Rust XMPP library xmpp-rs >[1]). > >The reason why this came up: There have in the past been cases ([2] >and >another, not-yet-filed issue against Prosody IM where the disco#info >feature >is missing from MUCs) where implementations didn't emit this feature. >The >seeming pointlessness and lack of information conveyed by this feature >var >make it easy to overlook and low-priority to fix. The fact that this >has gone >undiscovered for at least one Prosody IM release cycle further >supports the >assumption that the number of implementations which rely on that part >of the >spec is rather small. > >Your input is welcome. > >kind regards, >Jonas Schäfer >(these days without "special" role in the standards process) > > [1]: And there exists at least one fork which removed that check: > https://gitlab.com/nesium/xmpp-rs/-/commit/1ddb050 > [2]: >

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