TAP

TAP's goals are to enable the Semantic Web by providing some simple tools that make the web a giant distributed Database.

Provides a set of protocols and conventions that create a coherent whole of independantly produced bits of information, and a simple API to navigate the graph.

Local, independantly managed knowledge bases can be aggegated to form selected centers of knowledge useful for particular applications.

Interesting example of what Semantic Web and Web Services have to offer each other.

TAP is open source development effort by R.V. Guha (IBM) and Rob McCool (Stanford).