Errors in RDF Data

I'm wondering where I should report errors in the downloadable RDF data. I can see a lot of logical consistence errors wile parsing it.

Here is example:

<Topic r:id="Top/Arts/Animation/Artists/Directors/Freleng,_Friz">
<catid>78966</catid>
<d:Title>Freleng,_Friz</d:Title>
<related
r:resource="Top/Arts/Animation/Studios/Warner_Bros/Looney_Tunes/Characters/Tweety"/>
<related
r:resource="Top/Arts/Animation/Studios/Warner_Bros/Looney_Tunes/Characters/Yosemite_Sam"/>
<related
r:resource="Top/Arts/Animation/Cartoons/Titles/P/Pink_Panther,_The"/>
<related r:resource="Top/Arts/Animation/Studios/DePatie-Freleng"/>
<lastUpdate>2004-05-21 08:44:04</lastUpdate>
</Topic>

As you see it links to "Warner_Bros" directory.

There is however no such directory in the directories definitions,
Directory is defined as "Warner_Bros.":

<Topic r:id="Top/Arts/Animation/Studios/Warner_Bros.">
<catid>2468</catid>
<d:Title>Warner_Bros.</d:Title>
<related r:resource="Top/Arts/Television/Networks/WB"/>
<symbolic
r:resource="Freakazoid:Top/Arts/Animation/Cartoons/Titles/F/Freakazoid"/>
<symbolic
r:resource="Taz-Mania:Top/Arts/Animation/Cartoons/Titles/T/Taz-Mania"/>
<symbolic
r:resource="Tiny_Toon_Adventures:Top/Arts/Animation/Cartoons/Titles/T/Tiny_Toon_Adventures"/>
<symbolic
r:resource="Batman:Top/Arts/Animation/Cartoons/Titles/B/Batman"/>
<symbolic
r:resource="Batman_Beyond:Top/Arts/Animation/Cartoons/Titles/B/Batman/Batman_Beyond"/>
<symbolic
r:resource="Animaniacs:Top/Arts/Animation/Cartoons/Titles/A/Animaniacs"/>
<symbolic
r:resource="Cubix_Robots_for_Everyone:Top/Arts/Animation/Cartoons/Titles/C/Cubix_Robots_for_Everyone"/>
<symbolic
r:resource="Road_Rovers:Top/Arts/Animation/Cartoons/Titles/R/Road_Rovers"/>
<symbolic
r:resource="Pinky_and_The_Brain:Top/Arts/Animation/Cartoons/Titles/P/Pinky_and_The_Brain"/>
<symbolic
r:resource="Justice_League:Top/Arts/Animation/Cartoons/Titles/J/Justice_League"/>
<symbolic
r:resource="Histeria:Top/Arts/Animation/Cartoons/Titles/H/Histeria"/>
<symbolic
r:resource="Generation_O:Top/Arts/Animation/Cartoons/Titles/G/Generation_O"/>
<symbolic
r:resource="Superman:Top/Arts/Animation/Cartoons/Titles/S/Superman"/>
<symbolic
r:resource="Static_Shock:Top/Arts/Animation/Cartoons/Titles/S/Static_Shock"/>
<lastUpdate>2004-05-21 08:20:35</lastUpdate>
<narrow1 r:resource="Top/Arts/Animation/Studios/Warner_Bros./Movies"/>
<narrow1
r:resource="Top/Arts/Animation/Studios/Warner_Bros./Fan_Fiction"/>
<narrow1 r:resource="Top/Arts/Animation/Studios/Warner_Bros./Comics"/>
<narrow1 r:resource="Top/Arts/Animation/Studios/Warner_Bros./Television"/>
<narrow1
r:resource="Top/Arts/Animation/Studios/Warner_Bros./Chats_and_Forums"/>
<narrow
r:resource="Top/Arts/Animation/Studios/Warner_Bros./Looney_Tunes"/>
<newsGroup r:resource="news:alt.animation.warner-bros"/>
</Topic>

This, as well as many other issues could be fixed manually, but I'm wondering why it happens on the first place ? Might be original information should be checked and corrected ?

That is a known problem, resulting from renamed categories. When a category is renamed, the "old" category name is replaced by a redirect to the "new" one. So in theory the old names stay valid. AFAIK the file http://rdf.dmoz.org/rdf/redirect.rdf.u8.gz should help you - it lists all redirects that are in place. At the moment I can't check if the one you have spotted is in there due to this computers limitations.