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processing of babel blocks and select_tags

From: Eric S Fraga
Subject: processing of babel blocks and select_tags
Date: Fri, 18 Feb 2022 11:57:19 +0000
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux)

Hello all,

TL;DR: can I have org completely ignore src blocks in non-selected
sections during export without using COMMENT?

Longer version: I am in the process of writing a book.  I prefer to have
all the content in one file and use SELECT_TAGS to limit the export (for
formatting) to the current section I am working on.

I have noticed that all org babel src blocks are processed in some way
even if (a) they are not in a selected section and (b) have, for
instance, ":eval no-export" set.  For some of these blocks, the
processing time appears to be quite significant, e.g. if they have a
":var x=somebigtable", but I could be wrong about this, of course.

I do not understand why these src blocks are processed at all.  Is there
some way to stop them being processed?  I know I could "comment" out all
other sections but that's a lot more work and messy than simply tagging
the current section to be selected.

Attached is a minimal example.  When I export, I see these messages:

org-babel-exp process julia at position 162...
org-babel-exp process julia at position 384...

Thank you,

: Eric S Fraga, with org release_9.5.2-385-g37d8bc in Emacs 29.0.50

Attachment: tag.org
Description: Lotus Organizer

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