[Standards] Proposed XMPP Extension: Message Markup

Dave Cridland dave at cridland.net
Wed Nov 8 09:19:13 UTC 2017

On 8 November 2017 at 09:14, Jonas Wielicki <jonas at wielicki.name> wrote:
> On Mittwoch, 8. November 2017 08:44:16 CET Remko Tronçon wrote:
>> Hi,
>> On 7 November 2017 at 21:34, Jonas Wielicki <jonas at wielicki.name> wrote:
>> > The XMPP Extensions Editor has received a proposal for a new XEP.
>> Minor remark: the XEP says that spans MUST NOT overlap. Is there a reason
>> for this? I'm asking, because the systems I have seen that use external
>> markup
>> like this don't impose this.
> I think the rule can be loosened to "MUST NOT overlap each others boundaries".
> This will be needed if we ever allow erasing characters (see the other branch
> of this thread) to do so accurately.
> Overlapping boundaries however is tricky; XHTML and the big toolkits (Gtk and
> Qt) don’t support that either (you have to merge the styles manually in the
> overlapping region, if I’m not mistaken). So I’d like to have the sender fix
> that up, because they’ll have to anyways.

What would a receiver do if spans partially overlap? Should the
receiver reject the message, ignore the offending span[s], or what?


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