On 4/20/20 5:20 PM, Matthew Wild wrote> I have just updated the PR in response to feedback here and in the MUC. > > Changes: > > - Removed the separate iq for fetching a single message by id, this is > now done via the 'ids' field in the data form and supports multiple ids This MAM change, diff available at <http://geekplace.eu/xeps/xep-mam/diff.html>, uses a form field with the type list-multi to collect the IDs of the requested messages.
I know there was a discussion if the field type should be list-multi or text-multi. At first, the list-* types seemed unsuited, because they carry a "please select one (list-single) or potentially multiple (list-multi) items *from this list*" semantic. And everyone agrees that in MAM's case, we don't want the archive to provide a list of all valid IDs. So text-multi came into play. But someone raised concerns, that I sadly do not remember any more. Because of those concerns, list-multi with xep122 § 3.2.2 <open/> validation was chosen. This would do the trick. But, for one, it is a bit of misuse of <open/>: The <open/> validation means that you not only can select items from the form provided list, but also provide custom values (the latter would not be possible with plain list-* form fields from xep4). And furthermore, I really like to understand why text-multi is not exactly what we would need in this case. The text-multi form type is for example also used in PubSub (xep60) to list all children nodes of a collection node, and all collections a node is affiliated with. So it is used to aggregate N textual values (as opposed to text-single, which only allows at most 1 textual value). Sounds to me like a good fit for MAM message IDs. So why go for the slightly more complicated semantic of list-multi+<open/>, when we could just go with text-multi? - Florian
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