An intersting question... and C. M. Sperberg-McQuee has answered it in full.
I just want to stress what deep things it actually touches.
In fact, there is a constant flow of similar questions, which in one or another way come down to something like this:
I have some computational task and I know, there can be a program (script, stylesheet etc.) that does that task.
Now, I am looking for a software (or some feature of the software I use), to which I could feed some kind of description of my task, so that it would generate the program I need.
I wonder, why has nobody developed that software yet?
What's interesting is that the person effectively wants a software capable of doing something that only humans do: creative work.
Roger Penrose, a theoretical physicist, went further.
He had some ideas why such things will never exist.
Exactly, it concerns those very Turing-complete systems (capable to simulate a Turing machine).
The problem is that all what we can think as a computer is always a Turing-complete system (the so-called Church's thesis)...