libopc/third_party/libxml2-2.7.7/test/threads/acb.xml

<!DOCTYPE acb SYSTEM "http://example.org/acb.dtd">
<acb>
  <a>Let's use predefined entites &amp; &lt; &gt;</a>
  <c/>
  <b>Let's use a DTD defined entity &bent;</b>
</acb>