On Special:SpecialPages there is a "RDFIO Admin" section. There are also additional special pages for "RDF Import", "SPARQL Import" and "SPARQL Endpoint".
RDFIO assigns category tags to a page on the basis of predicate URLs found in the data. If a triple contains the predicate
it then assigns the object of that triple to a Category tag
The main wikipage has the category tag added, and then the category page is created and given an Equivalent URL property if it doesn't yet exist.
Similarly, when the predicate is the URL
then the page and parent page are updated appropriately.