@debacle @stevenroose @0
To be honest, I don't know. The configuration options come from the server. Sounds like this is a server feature where you can have a PubSub node associated with a MUC. But I don't know the particulars of this or which XEP it relates to.
Thanks! Indeed it's defined in XEP-0040 and appears related to XEP-0128 but neither document gives an explicit definition of it.
@jcbrand @debacle @stevenroose
Correction with apologies: XEP-0045
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