This trail section introduces some of the lower-level Webel utility packages for Mathematica and the Wolfram Language, including the Devel` package that is used by all other utility and application packages. Some of these packages would be obvious to most Mathematica users, and this trail section is not a focus of this technical slides trail, but could be of interest to some readers.
This section serves as a good introduction to modelling of Wolfram Language packages and their dependencies using Webel SysML4Mathematica (v1).
Note that very low-level packages such as Devel` do not have access to the Doc` or HelpF` packages (which Devel` serves) so use simple "freestyle" ::usage documentation of functions.
There is some overlap between functions in the Devel` package (which all other packages import) and the Utility` package (which most other packages import) and it's not always clear where some functions best belong.
