On 19 Jun 2018, at 13:13, Guus der Kinderen <[email protected]> wrote: > > > > On Tue, 19 Jun 2018 at 13:47, Kevin Smith <[email protected] > <mailto:[email protected]>> wrote: > On 19 Jun 2018, at 12:09, Bartłomiej Górny > <[email protected] > <mailto:[email protected]>> wrote: > > > > Hi > > > > If a XEP states that an attribute "MUST be empty", does it mean that it: > > a) must be present and have a value "" > > b) must not be there > > c) can be either of the two > > > > The question arose because of XEP-0313, which in point 5.1.2 says: > > > > "When sending out the archives to a requesting client, > > the 'to' of the forwarded stanza MUST be empty" > > > > and then gives an example where forwarded stanzas have no 'to' attribute. > > We just hit a situation where there are conflicting implementations, and we > > want to sort it out The Right Way, hence the question. > > Sounds like we messed up the text, sorry. The right thing is to not include a > to, rather than including a to=“” (which is illegal). > > > Is it (illegal)? It's valid in XML 1.0 and XML 1.1, if my Google skills are > not failing me. Differentiating between not having a to attribute, and having > a to attribute with an empty value seems needlessly complicated to me.
to= holds a JID, and a zero-length JID isn’t legal. /K
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