Sometimes, when I search a certain term, the result page says, "ERROR - Page not found". It means that the term is already indexed but it does not have an actual article for the term. For example, "Machine Learning" term in "wikipedia_en_2010-01-16" dump And the other question is about the dump. I found that there is an original dump from wikipedia ("http://dumps.wikimedia.org/") and the dump for evopedia is different from the original wikipedia dump (also different from Aard dictionary?). In that case, is there any way to make a dump from other dumps (a kind of own wikipedia?)