inside doesn't have the expected behavior

[Tardif, Sebastien]

This work:
<copy todir="${jsp.dst.dir}">
   <fileset dir="${dataviewservlet.dir}/sample">
    <selector>
     <or>
      <filename name="DVMainLogoComponent.jsp"/>
      <filename name="DVHitlistLogoComponent.jsp"/>
      <filename name="DVHyperlinksComponent.jsp"/>
     </or>
    </selector>
   </fileset>
</copy>
 
But this doesn't:
<copy todir="${jsp.dst.dir}">
   <fileset dir="${dataviewservlet.dir}/sample">
      <filename name="DVMainLogoComponent.jsp"/>
      <filename name="DVHitlistLogoComponent.jsp"/>
      <filename name="DVHyperlinksComponent.jsp"/>
    </fileset>
</copy>
 
And I received no error message so it's a valid Ant XML.
 
Anybody understand why the second version doesn't work?
What's the logic of the test?
 
I'm using ANT 1.6.5 which is the latest official release.