Carsten,

Recent changes to respect example indentations introduced a bug in both
DocBook and HTML exporters.  The following example

------------------------------------------------------------------------
#+BEGIN_EXAMPLE
Group of lines separated by empty lines:

  Line One.

  Line Two.
  Line Three.

  Line Four.
  Line Five.
#+END_EXAMPLE
------------------------------------------------------------------------

is exported to HTML like the following (note that every empty line in
the above example is repeated 3 times):

------------------------------------------------------------------------
<pre class="example">
Lines...



  Line One.



  Line Two.
  Line Three.



  Line Four.
  Line Five.
</pre>
------------------------------------------------------------------------

and to DocBook format like this (empty lines are removed):

------------------------------------------------------------------------
<programlisting><![CDATA[Group of lines separated by empty lines:
Line One.
Line Two.
  Line Three.
Line Four.
  Line Five.
]]>
</programlisting>
------------------------------------------------------------------------

Attached please find a patch to fix this problem.

Thanks,
Baoqiu