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-<head>
-<title>UK TeX FAQ -- question label edef</title>
-</head><body>
-<h3><code>\</code><code>edef</code> does not work with <code>\</code><code>protect</code></h3>
-<p/>Robust LaTeX commands are either &#8220;naturally robust&#8221; &#8212; meaning that
-they never need <code>\</code><code>protect</code>, or &#8220;self-protected&#8221; &#8212; meaning that
-they have <code>\</code><code>protect</code> built in to their definition in some
-way. Self-protected commands, and fragile commands with
-<code>\</code><code>protect</code>ion are only robust in a context where the <code>\</code><code>protect</code>
-mechanism is properly handled. The body of an <code>\</code><code>edef</code> definition
-doesn&#8217;t handle <code>\</code><code>protect</code> properly, since <code>\</code><code>edef</code> is a TeX
-primitive rather than a LaTeX command.
-<p/>This problem is resolved by a LaTeX internal command
-<code>\</code><code>protected@edef</code>, which does the job of <code>\</code><code>edef</code> while keeping the
-<code>\</code><code>protect</code> mechanism working. There&#8217;s a corresponding
-<code>\</code><code>protected@xdef</code> which does the job of <code>\</code><code>xdef</code>.
-<p/>Of course, these commands need to be tended carefully, since they&#8217;re
-
-internal: see <a href="FAQ-atsigns.html">&#8217;@&#8217; in control sequence names</a>.
-<p/><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=edef">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=edef</a>
-</body>