createrepo output

Hi,
I just ran createrepo-0.4.1 on a set of over 3000 packages and found out 
that some package elements have this additional file element in "format" 
  (<file>/usr/bin/t-prot</file>). What is it for exactly? Or is it some 
kind of garbage that should not be there?
This package has one file element, some packages have much more...

...
...
   <format>
     <rpm:license>Other License(s), see package, distributable</rpm:license>
     <rpm:vendor>SUSE LINUX AG, Nuernberg, Germany</rpm:vendor>
     <rpm:group>Productivity/Networking/Email/Utilities</rpm:group>
     <rpm:buildhost>welles.suse.de</rpm:buildhost>
     <rpm:sourcerpm>t-prot-1.0-196.src.rpm</rpm:sourcerpm>
     <rpm:header-range start="360" end="3264"/>
     <rpm:provides>
       <rpm:entry name="t-prot" flags="EQ" epoch="0" ver="1.0" rel="196"/>
     </rpm:provides>
     <rpm:requires>
       <rpm:entry name="rpmlib(PayloadFilesHavePrefix)" flags="LE" 
epoch="0" ver="4.0" rel="1" pre="1"/>
       <rpm:entry name="/usr/bin/perl"/>
       <rpm:entry name="rpmlib(CompressedFileNames)" flags="LE" 
epoch="0" ver="3.0.4" rel="1" pre="1"/>
       <rpm:entry name="Getopt-Mixed"/>
       <rpm:entry name="rpmlib(PayloadIsBzip2)" flags="LE" epoch="0" 
ver="3.0.5" rel="1" pre="1"/>
     </rpm:requires>
     <file>/usr/bin/t-prot</file>
   </format>
</package>



Anas