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-<head>
-<title>UK TeX FAQ -- question label semanticnest</title>
-</head><body>
-<h3>Capacity exceeded [semantic nest &#8230;]</h3>
-<p/>
-<pre>
-! TeX capacity exceeded, sorry [semantic nest size=100].
-...
-If you really absolutely need more capacity,
-you can ask a wizard to enlarge me.
-</pre>
-Even though TeX suggests (as always) that enlargement by a wizard
-may help, this message usually results from a broken macro or bad
-parameters to an otherwise working macro.
-<p/>The &#8220;semantic nest&#8221; TeX talks about is the nesting
-of boxes within boxes. A stupid macro can provoke the error pretty
-easily:
-<blockquote>
-
-<pre>
-\def\silly{\hbox{here's \silly being executed}}
-\silly
-</pre>
-</blockquote><p>
-The extended traceback
-
-(see <a href="FAQ-erroradvice.html"><em>general advice</em> on errors</a>)
-<em>does</em> help, though it does rather run on. In the case above,
-the traceback consists of
-<pre>
-\silly -&#62;\hbox {
- here's \silly being executed}
-</pre>
-followed by 100 instances of
-<pre>
-\silly -&#62;\hbox {here's \silly
- being executed}
-</pre>
-The repeated lines are broken at exactly the offending macro; of
-course the loop need not be as simple as this &#8212; if <code>\</code><code>silly</code> calls
-<code>\</code><code>dopy</code> which boxes <code>\</code><code>silly</code>, the effect is just the same and
-alternate lines in the traceback are broken at alternate positions.
-<p/>There are in fact two items being consumed when you nest boxes: the
-other is the grouping level. Whether you exhaust your
-<em>semantic nest</em> or your permitted <em>grouping levels</em> first is
-controlled entirely by the relative size of the two different sets of
-buffers in your (La)TeX executable.
-<p/><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=semanticnest">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=semanticnest</a>
-</body>