In recent conversation with a developer who was deploying some of my
XSLT code in a .NET framework, I tried to help him appreciate what
global parameters are, and how they need to be exposed to his C#
applications. I showed him a bit of source code. He was very
resistant, and said, in paraphrase, "I don't know why you're showing
me this. I don't understand XSLT, and I don't need to understand it. I
am only a programmer."

What would be your role in his universe where he is "only" a programmer?
What is the XSLT guy?