Using Wikipedia's dumps I want to build a hierarchy for its categories. I have downloaded the main dump (enwiki-latest-pages-articles) and the category SQL dump (enwiki-latest-category). But I can't find the hierarchy information.
For example, the SQL categories' dump has entries for each category but I can't find anything about how they relate to each other.
The other dump (latest-pages-articles) says the parent categories for each page but in an unordered way. It just states all the parents.
I have seen wikiprep's category hierarchy (http://www.cs.technion.ac.il/~gabr/resources/code/wikiprep/)... How is that one constructed? Wikiprep lists the category ID, not its name. Is there a way to get the name for each ID?