Variable: multi-prompt-key-value-sep
multi-prompt-key-value-sep is a variable defined in multi-prompt.el.
Value
"="
Documentation
Single-character string separating key=value pairs.
Source Code
;; Defined in ~/.emacs.d/elpa/auctex-14.1.2/multi-prompt.el
;;; Support for key=value completion
;; The following code was ripped out of crm.el
;; (completing-read-multiple) and extended to support comma-separated
;; key=value lists. The code is separate from the code above.
;; WARNING: This obviously relies on internals of crm.el and
;; minibuffer.el and will therefore have to be adapted if these
;; change.
;; TODO: How to support stuff like "caption={[one]two}" or
;; "morekeywords={one,three,five}"?
(defvar multi-prompt-key-value-sep "="
"Single-character string separating key=value pairs.")