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Re: What is a "superior mode"?

From: Dmitry Gutov
Subject: Re: What is a "superior mode"?
Date: Tue, 9 Mar 2021 13:54:06 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 
On 09.03.2021 06:54, Marcin Borkowski wrote:

the Elisp reference says (in the "Mode-Specific Indent" node):

  -- Function: prog-first-column
      Call this function instead of using a literal value (usually, zero)
      of the column number for indenting top-level program constructs.
      The function’s value is the column number to use for top-level
      constructs.  When no superior mode is in effect, this function
      returns zero.

What is a "superior mode" (and a "sub-mode", for that matter)?
It refers to a "multiple major modes" situation. Like Python embedded in HTML, that sort of thing. Or C inside Latex.
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