title: How to indent 4 spaces under SGML mode
body: <p>You know under SGML mode (PSGML) Emacs could indent the XML buffer automatically.</p>
  
  <pre><code>C-x-h ;; Select all
  M-C-\ ;; Indent
  </code></pre>
  
  <p>But all the indent was 2 spaces. How can I set to make auto indent to 4 spaces?</p>
  
  <p>I tried <code>(setq-default sgml-indent-step 4)</code>, but it doesn't work.</p>
  
  <p>Current view is:</p>
  
  <pre><code>&lt;TESTCASE&gt;
    &lt;NAME&gt;00001&lt;NAME&gt;
    &lt;TIMEOUT&gt;600000&lt;/TIMEOUT&gt;
  </code></pre>
  
  <p>My expectation is</p>
  
  <pre><code>&lt;TESTCASE&gt;
      &lt;NAME&gt;00001&lt;NAME&gt;
      &lt;TIMEOUT&gt;600000&lt;/TIMEOUT&gt;
  </code></pre>
  
  <p>Thanks!</p>
  
  <p>Using GNU Emacs 22.2.1 (i386-mingw-nt5.1.2600)<br>
  of 2008-03-26 on RELEASE</p>