Hi,<br>&nbsp;&nbsp; I am querying MediaWiki to get category information from Wikipedia for certain titles. I have written a java program to get the list but some titles do not return category results. <br><br>For example, "Populated places" does not return any category listing for the query but if you search Wikipedia, it gives categories. Following is the generated query for this particular title. I am trying to get results in JSON format. The query doesn't work for xml format either.<br><br><span style="font-weight: bold;">http://en.wikipedia.org/w/api.php?action=query&amp;prop=categories&amp;titles=Populated+places&amp;format=json&amp;cllimit=50&amp;clshow=%21hidden</span><br><br>what is the problem here???<br><br>Kalpa Gunaratna<br>