Apple Developer Connection has posted the SDK for Sherlock 3. Sherlock is an OS X application which consumes web services and converts them to a Cocoa view using XQuery and JavaScript. The SDK comes with a bare-bones channel you can install on a web server.
Be sure to install the Sherlock Developer Channels to get tools for testing XQuery, XPath, and JavaScript from Sherlock.
Acknowledgement of Controversy: Sherlock 3 competes with Watson, however, other than both being Cocoa apps, their internals are different.
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