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I have multiple documents which require cross-referencing from one another (I am the author of all of them). Each document lies in a separate folder.

As an example, everything lives in a directory named "main-folder". Within this directory, I have two directories: "folder-1" and "folder-2". Within each directory (folder-1 and folder-2) lives a TeX document, say file-1.tex is in folder-1 and file-2.tex is in folder-2.

I am using the xr package, and when two TeX documents needing cross-referencing are within the same directory (say, both in folder-1), I enter the following two lines in the preamble of file-1.tex:

\usepackage{xr}
\externaldocument[someprefix-]{file-2}

and this allows me to cross-reference labels from file-2.tex in file-1.tex via the usual \label and \ref commands, using someprefix- to distinguish between the labels in file-1.tex and those in file-2.tex.

I am wondering what the syntax should be if file-2.tex is in folder-2 instead of folder-1. I have already tried:

\externaldocument[someprefix-]{../file-2}
\externaldocument[someprefix-]{~/...insert-relevant-directory-here.../folder-2/file-2}

but nothing works. What am I doing wrong?

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    I'd expect ../folder2/file-2 to work, ~ would also work if you use \string~/... to prevent ~ expanding to non-breakable space – David Carlisle Dec 29 '16 at 21:25
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    "nothing works" isn't a description that anyone can debug. If it gives the wrong output, show the output, if it gives an error message or warning, show the text from the log file. – David Carlisle Dec 29 '16 at 21:43
  • have you tried the subfile package already? This also allows you to compile parts separate from each other while writing and all together for the finish. – Timothy Truckle Dec 29 '16 at 21:45
  • @David Carlisle: yes, you're right. What happens is that the file compiles (there is syntaxically nothing wrong of course) but the references appear as wrong (i.e. as ?? instead of 3.7 or something). I know that the error must be there however, since the same file-2.tex is in both folders, and when I change that \externaldocument line to work within folder-1 (i.e. if I write "file-2" as an argument instead like in my first example), everything works fine. – Patrick Da Silva Dec 30 '16 at 2:35
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    You need the same path that you would need to input the file. So if you compile in folder-1 ../folder-2/file-2 should work. – Ulrike Fischer Dec 30 '16 at 9:38
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This should work:

\externaldocument[someprefix-]{../folder-2/file-2}

Notice: Do not include the .tex extension.

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