passing the name of the file to be included as first parameter; the second argument is either empty (in which case the file will be included also in the print versions) or it contains LATEX-text which is to be included in the print versions instead of the file content. the online versions will provide a link to a popup window, showing the file content with line numbers for easier referencing from the article and a link to download the unaltered file.
Note: The example in Section 5 has been included using the above macro.
Living Rev. Relativity 16, (2013), 1
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