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org-manual.org: describe external reference for :var header
* org-manual.org: the description of the :var header argument for working with source code has been expanded to mention the possibility of having an external reference, a reference to an element in another file.
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@ -16797,7 +16797,11 @@ the =var= header argument.
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body. {{{var(ASSIGN)}}} is a literal value, such as a string,
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a number, a reference to a table, a list, a literal example, another
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code block---with or without arguments---or the results of evaluating
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a code block.
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a code block. {{{var(ASSIGN)}}} may specify a filename for references
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to elements in a different file, using a =:= to separate the filename
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from the reference.
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: :var NAME=FILE:REFERENCE
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Here are examples of passing values by reference:
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