Encourage clients to set pubsub#send_last_published_item to never and pubsub#max_items to some high value.
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Add examples about notifications and +notify.
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Request clients to add notify='1' on retract requests, so they do trigger notifications (see XEP-0060 ยง7.2.2.1 for a rationale).
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Announce a feature when the server supports compat between old &xep0048; (version 1.0) and this specification, and another between current &xep0048; (version 1.1) and this specification.