org-export-select-tags behaviour

org-export-select-tags behaviour

[Seb Frank]

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Hi,

Quoting the manual (12.1 Selective Export):

"1. Org first checks if any of the *select* tags is present in the buffer...
 2. If none of the select tags is found, the whole buffer will be selected
for export."

Is it possible to change this behaviour (i.e., to select nothing for export
if none of the /select/ tags are present), at least as an option? I'm using
org-caldav to synchronise selected entries in my org files with an external
calendar, and at some times in an org file there might happen to be no
headline present that I want exported -- in that case, I'd prefer not to
have /every/ headline exported, but none.

I've been trying to find where the selection/exclusion is done (in ox.el?),
but my limited lisp skills didn't get me far enough. Any pointers?

Many thanks,
  Seb

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