deeply nested sections with subtitles

diff --git a/testdocs/tests/section.005.xml b/testdocs/tests/section.005.xml
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+<article>
+  <articleinfo>
+    <title>Unit Test: section.005</title>
+    <subtitle>Deeply nested sections with subtitles</subtitle>
+    <releaseinfo role="CVS">$Id$</releaseinfo>
+    <author><firstname>Michael</firstname><surname>Smith</surname>
+    <affiliation><address><email>smith@sideshowbarker.net</email></address></affiliation>
+    </author>
+  </articleinfo>
+
+  <para>See <xref linkend="c2s1s1s2"/>.</para>
+
+  <section id="c2s1">
+    <title>Section 1</title>
+    <subtitle>Subtitle</subtitle>
+    <para>blah.</para>
+    <section id="c2s1s1">
+      <title>Section 1.1</title>
+      <subtitle>Subtitle</subtitle>
+      <para>blah.</para>
+      <section id="c2s1s1s1">
+       <title>Section 1.1.1</title>
+       <subtitle>Subtitle</subtitle>
+       <para>blah.</para>
+       <section id="c2s1s1s1s1">
+         <title>Section 1.1.1.1</title>
+         <subtitle>Subtitle</subtitle>
+         <para>blah.</para>
+         <section id="c2s1s1s1s1s1">
+           <title>Section 1.1.1.1.1</title>
+           <subtitle>Subtitle</subtitle>
+           <para>blah.</para>
+         </section>
+         <section id="c2s1s1s1s1s2">
+           <title>Section 1.1.1.1.2</title>
+           <subtitle>Subtitle</subtitle>
+           <para>blah.</para>
+           <section id="c2s1s1s1s1s2s1">
+             <title>Section 1.1.1.1.2.1</title>
+             <subtitle>Subtitle</subtitle>
+             <para>blah.</para>
+           </section>
+         </section>
+         <section id="c2s1s1s1s1s3">
+           <title>Section 1.1.1.1.3</title>
+           <subtitle>Subtitle</subtitle>
+           <para>blah.</para>
+         </section>
+       </section>
+       <section id="c2s1s1s1s2">
+         <title>Section 1.1.1.2</title>
+         <subtitle>Subtitle</subtitle>
+         <para>blah.</para>
+       </section>
+       <section id="c2s1s1s1s3">
+         <title>Section 1.1.1.3</title>
+         <subtitle>Subtitle</subtitle>
+         <para>blah.</para>
+       </section>
+      </section>
+      <section id="c2s1s1s2">
+       <title>Section 1.1.2</title>
+       <subtitle>Subtitle</subtitle>
+       <para>blah.</para>
+      </section>
+      <section id="c2s1s1s3">
+       <title>Section 1.1.3</title>
+       <subtitle>Subtitle</subtitle>
+       <para>blah.</para>
+      </section>
+    </section>
+    <section id="c2s1s2">
+      <title>Section 1.2</title>
+      <subtitle>Subtitle</subtitle>
+      <para>blah.</para>
+    </section>
+    <section id="c2s1s3">
+      <title>Section 1.3</title>
+      <subtitle>Subtitle</subtitle>
+      <para>blah.</para>
+    </section>
+  </section>
+
+</article>