A sketch is a set of definitions of links, variables, events, commands, and rules.
:: (link) defines a connection between a transducer and a PIN= (assignment) defines an event, a variable, or a command-> (rule) defines a rule? (show) shows all definitions with a given pattern+ (enable) enables all definitions with a given pattern- (disable) disables all definitions with a given pattern\ (clear) clears all definitions with a given pattern: (activate) activates all definitions with a given pattern