Hello,
in XEP-0060 §8.5 (https://xmpp.org/extensions/xep-0060.html#owner-purge)
it is said that:
If a service persists published items, a node owner may want to purge
the node of all published items (thus removing all items from the
persistent store, **with the exception of the last published item,
which MAY be cached**).
(emphasis is from me).
That means, apparently, that a service may or may not keep the last
item. This uncertainty make the behavior unpredictable thus the caching
impossible. I have provided a workaround in the currently discussed
protoXEP "Pubsub Caching Hints" (cf.
https://xmpp.org/extensions/inbox/pubsub-caching-hints.html#purge), but
it would be better to get totally rid of this formulation, and make sure
that a pubsub node purge remove **all** items.
I've discussed about that on xsf@ muc, and at least on author of Pubsub
XEP (Ralph Meijer) tends to agree.
I've proposed a patch to fix that at
https://github.com/xsf/xeps/pull/1096, but because the XEP is in Draft
and I'm not one of the authors, this needs authors review and/or council
approval.
I'm posting here to have some feedback and see if XMPP community agrees
to do this fix.
Thanks
Goffi
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