One of the first things I started wondering about as I got used to reading OPC (other peoples code) is just EXACTLY what is BIML doing at any given point in the code. You can make some educated guesses based on the SSIS packages (in my case I’m exclusively interested in BIML for SSIS but of course it can do a lot more than that), but it’s easy to get lost, especially when there’s a lot of BIML script and some of it is only used to establish a data model in memory or to create / fill variables that will be used in SSIS. I was delighted to discover the following piece of code that can show you exactly what BIML is doing based on the code you are writing.
If you don’t have BimlStudio, this trick is vital for figuring out what’s going wrong.