[Standards] Proposed XMPP Extension: User-defined Data Transfer

Marvin W xmpp at larma.de
Tue Dec 31 10:58:43 UTC 2019

On 12/31/19 8:01 AM, Jonas Schäfer wrote:
> I do not see anything wrong per se with XEPs built for a very specific API. We have that already with the XML-RPC embedding (which went somewhat out of fashion).

I don't think this comparison makes a lot of sense.

Assuming you refer to XEP-0009, this describes a way how to use an
existing, well-known protocol inside XMPP. However, neither XEP-0009 nor
XML-RPC spec define, how this transport protocol should be exposed in
the API of client libraries - and as far as I know, there is also no
such common API for XML-RPC libraries.

If this was about using JSON instead of XML for RPC calls, it should
just rely on the JSON-RPC protocol.

> Maybe it would also be worth to move the API description into its own Informational XEP (like we did for XEP-0300) or an XSF external document. This would also allow to evolve the API independently of the wire protocol.
I'd be happy with splitting into two XEPs: one Standards track for the
wire protocol and one Informational XEP "Best practices for library
implementations of User-defined Data Transfer" (or sth alike). I'd still
question the usefulness of the wire protocol (compared to specifying in
that Informational XEP a library API that doesn't require a new wire
protocol but provides the same features with probably even a lower
overhead), but that shouldn't keep either of the two from becoming
Experimental (remembering that Experimental means that it should not be
part of released software).

The current proposal IMO stretches the definition of a Standards Track
XEP too much to be accepted on that track.


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