I am one of the people that use Context for working with
files that are purely text. This editor has support for finding matching brackets, highlighting a lot of source code and I am used to it. But it did not have support for highlighting SDF files. I say had because I have put one together. This is not a real big deal, if you look at the contents of the file you will see this, but it might save someone some time. So a highlighter for SDF in Context can be found here, and for the testsuite-file here.
And off course a little status update. The SDF can parse and is tested against expressions and a few statements. It also does a pretty good job on the files from the distribution of version 4. So we are definitely going in the right direction.