A Maude environment for CafeOBJ

We present in this paper an interpreter implemented in Maude for non-behavioral CafeOBJ specifications. This alternative implementation poses a number of advantages: (1) it allows Maude tools to be used with CafeOBJ specifications, (2) it improves the performance of some CafeOBJ commands, such as search, (3) it enriches CafeOBJ syntax with Maude syntax, and (4) it makes CafeOBJ easily extensible, since new commands and tools can be included and tested and, once they are sufficiently mature, can be considered for inclusion in the Lisp implementation of CafeOBJ. The current tool presents a number of improvements over the tool presented in previous papers: it supports principal sorts, all kinds of CafeOBJ views, and all the search predicates recently implemented in the system. These improvements have allowed us to run the most recent CafeOBJ specifications, hence proving the robustness of the tool. Moreover, we present case studies illustrating the power of the tool, focusing on the falsification and verification of the NSPK and QLOCK protocols, respectively.