As I understand it, HC mappings work roughly as follows: 1) A mapping file specifies some hashes and code. 2) HC uses this (via metaprogramming) to generate methods, callbacks, etc. 3) The application code uses the HC methods. Even if the core HC code is perfect, a new mapping file is all too likely to contain bugs. So, I'm wondering what features HC could/should/does contain to ease debugging. For example, it can be very useful to examine (and even edit) a textual representation of generated code, serialization formats, etc. Web programmers take advantage of this when they use View Source and Firebug to see what CSS/HTML/JS/... the browser is trying to interpret. Could HC generate an intermediate format (eg, MR code) that the developer could examine, tweak, etc? -r -- http://www.cfcl.com/rdm Rich Morin http://www.cfcl.com/rdm/resume rdm@cfcl.com http://www.cfcl.com/rdm/weblog +1 650-873-7841 Technical editing and writing, programming, and web development