This is the official manual for the latest Org-mode release.
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System-wide values of header arguments can be specified by adapting the
org-babel-default-header-args variable:
:session => "none"
:results => "replace"
:exports => "code"
:cache => "no"
:noweb => "no"
For example, the following example could be used to set the default value of
:noweb header arguments to yes. This would have the effect of
expanding :noweb references by default when evaluating source code
blocks.
(setq org-babel-default-header-args
(cons '(:noweb . "yes")
(assq-delete-all :noweb org-babel-default-header-args)))