To avoid confusion, let's call it stages.

Stage 1: Always call post-bound executions (MNG-5665[1])
Stage 2: before and after
Stage 3: priorities (MNG-3522[2])
Stage 4: transitional lifecycle

For both all you need to start evaluating the value of phase.
For now we can assume that after:clean is just another label for post-clean and 
will have exactly the same effect.
MNG-5665 contains a proposal to change the xml, but we shouldn't do that (yet). 
Let's start with a hardcoded list of postphases (or in case a goal fails, see 
if a post-x phase exists). Stage 1 is to make it work, stage 2 to make it 
configurable.
IIRC you cannot ask from inside a Mojo if is was called explicitly or because 
it was bound to a phase, nor can you ask for the value of this phase. I kind of 
like this, plugins shouldn't care about this.
However, inside Maven it will become important at which phase it is to know if 
there are more executions to call OR create blocks of executions. Now it is 
just a list of executions: loop and fail fast.

thanks,
Robert

[1] https://issues.apache.org/jira/browse/MNG-5665
[2] https://issues.apache.org/jira/browse/MNG-3522
On 25-10-2019 21:33:14, Stephen Connolly <stephen.alan.conno...@gmail.com> 
wrote:
Robert,

I would be fine splitting out into, pardon the pun, phases:

Phase 1: before and after
Phase 2: priorities 
Phase 3: transitional lifecycle

Might have a phase 1.5 of before:* and after:* to catch the start of a 
lifecycle and the end of a lifecycle...

On Fri 25 Oct 2019 at 20:30, Stephen Connolly <stephen.alan.conno...@gmail.com 
[mailto:stephen.alan.conno...@gmail.com]> wrote:

Robert, Michael, Tibor, let’s continue here (though I asked Infra and it’s fine 
that anyone in the community can join our Slack)

On Fri 25 Oct 2019 at 20:01, Stephen Connolly <stephen.alan.conno...@gmail.com 
[mailto:stephen.alan.conno...@gmail.com]> wrote:

https://cwiki.apache.org/confluence/display/MAVEN/Dynamic+phases 
[https://cwiki.apache.org/confluence/display/MAVEN/Dynamic+phases]

Thoughts?
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