I've been looking at the id structure of dbpedia and wikipedia and finally found an example where case sensitivity issues really bite.
Cases like this with a "redirect" are a little obnoxious,
http://en.wikipedia.org/wiki/New_York_City http://en.wikipedia.org/wiki/New_york_city
largely because there isn't a redirect... The same page gets displayed at each URL. (Ok, the "redirect" has a little extra stuff at the top saying that's a redirect)
dbpedia has separate resource pages for the above cases, so at least it's explaining the situation clearly -- reasoning systems that work with dbpedia need to be able to read this.
Here's a case that's just plain bad...
http://en.wikipedia.org/wiki/Direct_instruction http://en.wikipedia.org/wiki/Direct_Instruction
Last time I looked there were about 10,000 wikipedia urls that varied only by case. In this particular one, it's two articles about the same topic, but there could be some cases where the two articles are about something different.