API language interface to tla-sbuilder. Uses API Loader Extension Point and Snippet Loader Extension Point in tla-sbuilder tool. tla-sbuilder is a tool to generate runnable formal models in TLA+ language http://research.microsoft.com/en-us/um/people/lamport/tla/book.html Generated formal models can be verified using TLA+ Tools http://research.microsoft.com/en-us/um/people/lamport/tla/tools.html.