Variable: org-export-select-tags
org-export-select-tags is a customizable variable defined in ox.el.gz.
Value
("export")
Documentation
Tags that select a tree for export.
If any such tag is found in a buffer, all trees that do not carry
one of these tags will be ignored during export. Inside trees
that are selected like this, you can still deselect a subtree by
tagging it with one of the org-export-exclude-tags.
This option can also be set with the SELECT_TAGS keyword.
Source Code
;; Defined in /usr/src/emacs/lisp/org/ox.el.gz
(defcustom org-export-select-tags '("export")
"Tags that select a tree for export.
If any such tag is found in a buffer, all trees that do not carry
one of these tags will be ignored during export. Inside trees
that are selected like this, you can still deselect a subtree by
tagging it with one of the `org-export-exclude-tags'.
This option can also be set with the SELECT_TAGS keyword."
:group 'org-export-general
:type '(repeat (string :tag "Tag"))
:safe (lambda (x) (and (listp x) (cl-every #'stringp x))))