If you were just commissioned to rethink your town's main library in line with 21st-century knowledge, the first thing you'll make is a schema: an outline of your plan for reinventing libraries.
Schema sounds like scheme, but they have different nuances. You scheme to snatch a cookie from the jar. A schema is more of a master plan. It can also just be an organized vision. If you have a master concept about how the world works, that's your world organization schema. Someone with an insanely big idea about how to change the world has "a grand schema." Now she just needs to make a practical schema for actually making that change.
