dmoz data is made available through an rdf-like dump that is published on a download server, older versions are also archived there. new versions are usually generated weekly. a dmoz editor has catalogued a number of bugs that are encountered in the dmoz rdf dump, most importantly that the file format isn't rdf. so while today the so-called rdf dump is valid xml, it is not valid rdf and as such, software to process the dmoz rdf dump needs to be specifically written for dmoz data.