docbook + prettyprint = bug?

Hello,

This docbook fragment...

<para>

      <emphasis>A</emphasis><emphasis
role="strong">B</emphasis><superscript>C</superscript><phrase
role="red">E</phrase>    

</para>

...gives that : ABCE

If we do a prettyprint...

<para>

      <emphasis>A</emphasis>

      <phrase role="italic">B</phrase>

      <superscript>C</superscript>

      <phrase role="red">E</phrase>    

</para>

...the output is now : A B C E

This is a stupid example, but I have real big docbook with this problem
and it's unreadable to don't use prettyprint.

Have an idea?

Thanks,

Dominic