Introducing a semantic changelog XML notation

Greetings,

I recently did my first contribution to the phpdocs, it was a missing
changelog entry for mb_convert_case(). For the first time I saw the syntax
of the XML files and I had the immediate feeling a semantic <changelog> XML
construct is missing.

Given the importance of the changelog (as full time PHP developer I consult
the "Changelog" section of the manual pages A LOT) I believe it deserves
its own XML tag instead of using <informaltable>.

I was thinking about something like (a very random idea, not thought
through yet):

<changelog>
  <row>
    <version>7.3.0</version>
    <entry>Changed this and that.</entry>
  </row>
</changelog>

Do you think this kind of change would be accepted? Has this been discussed
before?
It would be quite some work to introduce the new markup and create a
migration script for the existing documentation, so I'm looking for
preliminary feedback before venturing into this.

Thank you for your attention.

GG.