Hi

The current org latex export will export a link doi:10.xyz/abcd without

the protocol prefix as 10.xyz/abcd. Correctly, it should retain the

prefix.

An easy fix is adding "doi" to the list of protocols that retain

the link type string in ox-latex.el, below.

################### ox-latex.el ###############

(defun org-latex-link (link desc info)

  "Transcode a LINK object from Org to LaTeX.

DESC is the description part of the link, or the empty string.

INFO is a plist holding contextual information.  See

`org-export-data'."

  (let* ((type (org-element-property :type link))

(raw-path (replace-regexp-in-string

   "%" "\\%" (org-element-property :path link) nil t))

;; Ensure DESC really exists, or set it to nil.

(desc (and (not (string= desc "")) desc))

(imagep (org-export-inline-image-p

 link org-latex-inline-image-rules))

(path (cond

                ;; ----- NEXT LINE CONTAINS THE FIX -------

((member type '("http" "https" "ftp" "mailto" "doi"))

(concat type ":" raw-path))

((and (string= type "file") (file-name-absolute-p raw-path))

(concat "file:" raw-path))

(t raw-path)))

protocol)

#############

Best regards,

Derek