Who can I tell about malformed data in the RDF dump?

The following malformed data is in the structure file. (The altlang and lastUpdate tags should not appear outside enclosing Topic tags. The </Topic> has no preceding <Topic> tag.) To whom should I report this?

<Alias r:id="Cani:Top/World/Italiano/Società/Temi_e_Dibattiti/Bese:Top/World/Japanese/社会/問題・争点/犯罪と司法"/>
<altlang r:resource="Svedese:Top/World/Svenska/Samhälle/Debattämnen/Brott_och_straff"/>
<lastUpdate>2008-07-11 06:34:15</lastUpdate>
</Topic>

I've reported the problem.

I presume you're referring to the structure.rdf.u8.gz file at http://rdf.dmoz.org/rdf/ that is dated 15-Apr-2009. If so, we know that there have were problems with that RDF dump. Subsequent problems have prevented any more recent dumps from being published either. :-( AOL staff are aware of the problems.