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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: What is :core? (was: Stability of core packages (was: Not easy at
 all to upgrade :core packages like Eglot))
Date: Wed, 19 Apr 2023 16:03:17 +0300
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 (message from Lynn Winebarger on Wed, 19 Apr 2023 08:31:16 -0400)
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> From: Lynn Winebarger <owinebar@gmail.com>
> Date: Wed, 19 Apr 2023 08:31:16 -0400
> Cc: Dmitry Gutov <dmitry@gutov.dev>,
>  João Távora <joaotavora@gmail.com>, 
>  emacs-devel <emacs-devel@gnu.org>
> 
> Is there any documentation for what ":core" refers to?  Executing
> "grep -rn ':core' *" in the emacs source yields the following, which
> doesn't include any explanation:

It is ELPA terminology, so the answer is in ELPA's file elpa-packages:

  ;; List of packages that are maintained externally.
  ;; The list is made of elements of the form (NAME KIND URL OPTS...).
  ;; See `admin/README' for further documentation about the format.
  ;;
  ;; Where NAME is the name of the package;
  ;;
  ;; KIND can be one of:
  ;;  :url      = kept in a separate `externals/<name>' branch.
  ;;  :core     = part of GNU Emacs repository.