from travis ci: simplify inclusion of dtd files, as documented in issue #41

Author: openmath-travis

standard/om20-editors-draft/omstd20-diff.html

@@ -11741,7 +11741,7 @@ <h2 id="app_dtd">
          </p>
 
          <div class="literal"><pre>
-    &lt;?xml encoding="UTF-8"?&gt;
+&lt;?xml encoding="UTF-8"?&gt;
 
 &lt;!-- RELAX NG Schema for OpenMath 2 --&gt;
 
@@ -11886,8 +11886,7 @@ <h2 id="app_dtd">
   xmlns CDATA #FIXED 'http://www.openmath.org/OpenMath'
   %common.attributes;
   href CDATA #REQUIRED&gt;
-
-  </pre></div>
+</pre></div>
 
       </div>
 

standard/om20-editors-draft/omstd20-diff.pdf

@@ -11517,7 +11517,7 @@ <h2 id="app_dtd">
          </p>
 
          <div class="literal"><pre>
-    &lt;?xml encoding="UTF-8"?&gt;
+&lt;?xml encoding="UTF-8"?&gt;
 
 &lt;!-- RELAX NG Schema for OpenMath 2 --&gt;
 
@@ -11662,8 +11662,7 @@ <h2 id="app_dtd">
   xmlns CDATA #FIXED 'http://www.openmath.org/OpenMath'
   %common.attributes;
   href CDATA #REQUIRED&gt;
-
-  </pre></div>
+</pre></div>
 
       </div>