Abstract
Attempto Controlled English (ACE) is a mature and expressive knowledge representation language. To test the limits of ACE's expressivity we describe ACE and its associated tools in ACE itself. While this abstract and the reference section use unconstrained English, the rest of the article is expressed in ACE and can be submitted to the Attempto Parsing Engine (APE). The plain text version of the content of this paper and the lexicon needed to parse it can be found online.