This is hard to understand. A PCB is fundamentally a graphical design. I would think you would need to see it to understand what it's doing. There are no fix

This is hard to understand. A PCB is fundamentally a graphical design. I would think you would need to see it to understand what it's doing. There are no fixed references in a PCB design as there are on a page of paper (which will always have an upper-left corner to reference everything from). On the other hand, the schematic requires no graphical representation and is easily written as a netlist. SPICE works in netlists and most (all?) PCB packages import a netlist. If you wish to represent a schematic as code, that's the way to do it. My initial opinion notwithstanding, if you write a program to let me compile gerbers from code, I'll try my hand at writing a PCB out.