Hi,

this is partly a follow up to [1] and [2] - and sorry in advance to bring this 
up again,
but I feel we are too conservative.

Summary:
When we introduce new methods/enums/classes/... we try to be compile compatible 
with older versions.
After two releases the deprecated stuff can be removed.
Logic can be annotated internal, making it easier to change.

Does "release" mean a final or a beta release?
If it's a beta, it would probably make more sense to remove the deprecated 
stuff in the final release
and not spanning it over to the next final round. But then one could also drop 
the deprecated stuff
immediately, because it's just a beta ...

I'm not sure if the following conclusions based on the download stats [3] (only 
PMCs) are valid:
There's not much interest in betas after the final is out (... I know captain 
obvious is greeting)
3.9 is still quite frequently requested - the later version are approx. equally 
downloaded.
- are people are so slowly adapting, because the older version satisfy their 
needs?
- if we have the 2-release-deprecate-rule, does this really matter, i.e. are 
people gradually
  upgrading the version or do they jump over several releases anyway and need 
to be
  prepared for api breaks?

So lets assume we add a version comment to each deprecated element for a later 
removal.
In this case we have to check the logic twice, when deprecating it and when 
removing it.
I think this is tedious ... and the removing won't be done later ... having 
lots of deprecated stuff
around (see HWPF), which nobody wants to touch.

For X/HSLF I've decided to remove stuff immediately - having the scratchpad 
label as an excuse.

I try to think about a measure, when something should be kept available for 
longer or
can be removed immediately ... how about how often it used in the examples?
i.e. if less than 2 matches are found -> removed it
otherwise deprecate it

Best wishes,
Andi

[1] 
http://apache-poi.1045710.n5.nabble.com/Logging-Binary-compatibility-tt5719152.html
[2] https://bz.apache.org/bugzilla/show_bug.cgi?id=58636
[3] https://repository.apache.org/#central-stat

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