Description list with " :: " in the tag.

["Tom Alexander" <tom@fizz.buzz>]

Emacs version: 29.1
Org-mode version: 163bafb43dcc2bc94a2c7ccaa77d3d1dd488f1af

Found a conflict between the documentation and the parser behavior. The org-mode documentation[1] for description list items says that TAG '[...] does not contain the substring " :: "'

Using this sample document, I have created a plain list item with a tag that contains that substring by wrapping it in a verbatim block:
```
- =foo :: bar= :: baz
```

Which parses to:
```
(org-data
 (:standard-properties
  [1 1 1 23 23 0 nil org-data nil nil nil 3 23 nil #<buffer *scratch*> nil nil nil]
  :path nil :CATEGORY nil)
 (section
  (:standard-properties
   [1 1 1 23 23 0 nil first-section nil nil nil 1 23 nil #<buffer *scratch*> nil nil #0])
  (plain-list
   (:standard-properties
    [1 1 1 23 23 0 nil top-comment nil nil nil nil nil nil #<buffer *scratch*> nil
       ((1 0 "- " nil nil "=foo :: bar=" 23))
       #1]
    :type descriptive)
   (item
    (:standard-properties
     [1 1 19 23 23 0
        (:tag)
        item nil nil nil nil nil nil #<buffer *scratch*> nil
        ((1 0 "- " nil nil "=foo :: bar=" 23))
        #2]
     :bullet "- " :checkbox nil :counter nil :pre-blank 0 :tag
     ((verbatim
       (:standard-properties
        [3 nil nil nil 15 0 nil nil nil nil nil nil nil nil #<buffer *scratch*> nil nil #3]
        :value "foo :: bar"))))
    (paragraph
     (:standard-properties
      [19 19 19 23 23 0 nil nil nil nil nil nil nil nil #<buffer *scratch*> nil nil #3])
     #("baz\n" 0 4
       (:parent #4)))))))
```

It seems that "TAG-TEXT" is not just text but it can include objects and those objects can include the substring " :: ".

[1] https://orgmode.org/worg/org-syntax.html#Items

--
Tom Alexander