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authorKarl Berry <karl@freefriends.org>2011-05-04 23:39:21 +0000
committerKarl Berry <karl@freefriends.org>2011-05-04 23:39:21 +0000
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parent9a8f00b89c2c1cd283f5fd0fb54959ef0690646f (diff)
FAQ-en 3.22 (4may11)
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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&#8217;ll often want to
-refer to labels in another document of the set; but LaTeX, of its
-own accord, doesn&#8217;t permit this.
-<p/>So the package <i>xr</i> was written: if you say
-<blockquote>
-<pre>
-\usepackage{xr}
-\externaldocument{volume1}
-</pre>
-</blockquote><p>
-will load all the references from <i>volume1</i> into your present
-document.
-<p/>But what if the documents both have a section labelled
-&#8220;<code>introduction</code>&#8221; (likely enough, after all)? The
-package provides a means to transform all the imported labels, so you
-don&#8217;t have to change label names in either document. For example:
-<blockquote>
-<pre>
-\usepackage{xr}
-\externaldocument[V1-]{volume1}
-</pre>
-</blockquote><p>
-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><p>
-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&#8217;ve just
-compiled), write:
-<blockquote>
-<pre>
-\usepackage{xr-hyper}
-\usepackage{hyperref}
-\externaldocument[V1-]{volume1}
-...
-... the \nameref{V1-introduction})...
-</pre>
-</blockquote><p>
-and the name reference will appear as an active link to the
-&#8220;introduction&#8221; 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><p>
-Heiko Oberdiek&#8217;s experimental <i>zref</i> bundle includes a
-hyper-crossreferencing mechanism using its <i>zref-xr</i> module.
-Usage is closely modelled on <i>xr</i> and <i>xr-hyper</i>; a
-trivial example (from a <i>comp.text.tex</i> posting) is
-<blockquote>
-<pre>
-\usepackage{zref-xr,zref-user}
-\zexternaldocument*{xr02}
-...
-\zref{foo}
-</pre>
-</blockquote><p>
-The module provides all the facilities of the older packages, and can
-deal both with &#8220;traditional&#8221; LaTeX labels and with
-<i>zref</i>&#8217;s style of labels.
-<dl>
-<dt><tt><i>xr.sty</i></tt><dd>Distributed as part of <a href="http://mirror.ctan.org/macros/latex/required/tools.zip">macros/latex/required/tools</a> (or <a href="http://mirror.ctan.org/macros/latex/required/tools/">browse the directory</a>); <a href="http://mirror.ctan.org/help/Catalogue/entries/xr.html">catalogue entry</a>
-<dt><tt><i>xr-hyper.sty</i></tt><dd>Distributed with <a href="http://mirror.ctan.org/macros/latex/contrib/hyperref.zip">macros/latex/contrib/hyperref</a> (or <a href="http://mirror.ctan.org/macros/latex/contrib/hyperref/">browse the directory</a>); <a href="http://mirror.ctan.org/help/Catalogue/entries/xr-hyper.html">catalogue entry</a>
-<dt><tt><i>zref bundle</i></tt><dd>Distributed as part of
- <a href="http://mirror.ctan.org/macros/latex/contrib/oberdiek.zip">macros/latex/contrib/oberdiek</a> (or <a href="http://mirror.ctan.org/macros/latex/contrib/oberdiek/">browse the directory</a>); <a href="http://mirror.ctan.org/help/Catalogue/entries/zref.html">catalogue entry</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>