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<head>
<title>UK TeX FAQ -- question label extref</title>
</head><body>
<h3>Referring to labels in other documents</h3>
<p>When producing a set of inter-related documents, you'll often want to
refer to labels in another document of the set; but LaTeX, of its
own accord, doesn't permit this.
<p>So the package <i>xr</i> was written: if you say
<blockquote>
<pre>
\usepackage{xr}
\externaldocument{volume1}
</pre>
</blockquote>
will load all the references from <i>volume1</i> into your present
document.
<p>But what if the documents both have a section labelled
"<code>introduction</code>" (likely enough, after all)? The
package provides a means to transform all the imported labels, so you
don't have to change label names in either document. For example:
<blockquote>
<pre>
\usepackage{xr}
\externaldocument[V1-]{volume1}
</pre>
</blockquote>
loads the references from <i>volume1</i>, but prefixes every one with
the string <code>V1-</code>. So you would refer to the introduction to volume 1
as:
<blockquote>
<pre>
\usepackage{xr}
\externaldocument[V1-]{volume1}
...
... the introduction to volume1 (\ref{V1-introduction})...
</pre>
</blockquote>
To have the facilities of <i>xr</i> working with
<i>hyperref</i>, you need <i>xr-hyper</i>. For simple
hyper-cross-referencing (i.e., to a local PDF file you've just
compiled), write:
<blockquote>
<pre>
\usepackage{xr-hyper}
\usepackage{hyperref}
\externaldocument[V1-]{volume1}
...
... the \nameref{V1-introduction})...
</pre>
</blockquote>
and the name reference will appear as an active link to the
"introduction" chapter of <i>volume1.pdf</i>.
<p>To link to a PDF document on the Web, for which you happen to
have the .aux file, write:
<blockquote>
<pre>
\usepackage{xr-hyper}
\usepackage{hyperref}
\externaldocument[V1-]{volume1}[http://mybook.com/volume1.pdf]
...
... the \nameref{V1-introduction})...
</pre>
</blockquote>
<dl>
<dt><tt><i>xr.sty</i></tt><dd>Distributed as part of <a href="ftp://cam.ctan.org/tex-archive/macros/latex/required/tools.zip">macros/latex/required/tools</a> (<a href="ftp://cam.ctan.org/tex-archive/macros/latex/required/tools.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/macros/latex/required/tools/">browse</a>)
<dt><tt><i>xr-hyper.sty</i></tt><dd>Distributed with <a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/hyperref.zip">macros/latex/contrib/hyperref</a> (<a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/hyperref.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/macros/latex/contrib/hyperref/">browse</a>)
</dl>
<p>
<p><p><p><p><p><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=extref">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=extref</a>
</body>
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