This is the official manual for the latest Org-mode release.

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System-wide header arguments

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"

This example sets the default value of :noweb header arguments to yes, which expands :noweb references by default.

     (setq org-babel-default-header-args
           (cons '(:noweb . "yes")
                 (assq-delete-all :noweb org-babel-default-header-args)))