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

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The :noweb header argument controls expansion of “noweb” syntax references (see Noweb reference syntax) when the code block is evaluated, tangled, or exported. The :noweb header argument can have one of the five values: no, yes, tangle, or no-export strip-export.

Noweb prefix lines

Noweb insertions are now placed behind the line prefix of the <<reference>>. This behavior is illustrated in the following example. Because the <<example>> noweb reference appears behind the SQL comment syntax, each line of the expanded noweb reference will be commented.

This code block:

     -- <<example>>

expands to:

     -- this is the
     -- multi-line body of example

Note that noweb replacement text that does not contain any newlines will not be affected by this change, so it is still possible to use inline noweb references.