During the past year, we have redesigned the toolkit with respect to user experience and the EXPRESS DIS. Our work will be of interest to implementors of EXPRESS DIS. Our work will be of interest to implementors of EXPRESS tools and toolkits. This paper describes our work and the current state of the NIST EXPRESS toolkit.
As well as describing our efforts in improving the toolkit performance, we will comment on: the hard parts of implementing the EXPRESS language, things we did wrong, several implementation-dependent extensions to EXPRESS, and sophisticated error and warning detection.
We will also revisit our original ideas underlying the toolkit concept. We will discuss whether, in light of our experiences, the concepts still make sense, can be amended, or should be entirely scrapped.