Can I create a custom plist structure definition?

Question

When editing plist files in Xcode, it can detect the type of plist and show human-readable strings to make it more easy to edit the file. The Info.plist, for example.

Answer 1

I found the answer. I have to put it in

~/Library/Application Support/Developer/Shared/Xcode/Plug-ins/

Answer 2

FYI, PlistEdit Pro also provides a custom interface for creating and editing plist structure definitions, if you don't want to have to mess around with XML.