Paragraph 4.2 point 3 cites:<< The "pubsub#access_model" SHOULD be set to "open" to allow any user to comment to a post. Other values are suitable too according to the user's settings. >>
While the description for the open access model in XEP-60 cites:<< Any entity may subscribe to the node (i.e., without the necessity for subscription approval) and any entity may retrieve items from the node (i.e., without being subscribed); this SHOULD be the default access model for generic pubsub services. >>
Which means that everyone can subscribe and retrieve items from the node, but _not_ post to it as 4.2.3 in XEP-277 says.
Regards.
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