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Added introductory example to output format documentation.

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Patrick Lühne 2016-08-13 18:47:01 +02:00
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`plasp` 3 translates SAS and PDDL files into the same ASP fact format.
`plasp` structures the translated ASP facts into the multiple sections, which are explained in the following.
## In a Nutshell
The following illustrates `plasp`’s output format for the problem of turning switches on and off.
```prolog
% declares the type "type(switch)"
type(type(switch)).
% introduces a switch "constant(a)"
constant(constant(a)).
has(constant(a), type(switch)).
% introduces another switch "constant(a)"
constant(constant(b)).
has(constant(b), type(switch)).
% declares a variable "variable(on(X))" for each switch X
variable(variable(on(X))) :- has(X, type(switch)).
% the variable may be true or false
contains(variable(on(X)), value(on(X)), true)) :- has(X, type(switch)).
contains(variable(on(X)), value(on(X)), false)) :- has(X, type(switch)).
% declares the action "action(turnOn(X))", which requires switch X to be off and then turns it on
action(action(turnOn(X))) :- has(X, type(switch)).
precondition(action(turnOn(X)), variable(on(X)), value(on(X), false)) :- has(X, type(switch)).
postcondition(action(turnOn(X)), effect(0), variable(on(X)), value(on(X), true)) :- has(X, type(switch)).
% declares the action "action(turnOff(X))", which requires switch X to be on and then turns it off
action(action(turnOff(X))) :- has(X, type(switch)).
precondition(action(turnOff(X)), variable(on(X)), value(on(X), true)) :- has(X, type(switch)).
postcondition(action(turnOff(X)), effect(0), variable(on(X)), value(on(X), false)) :- has(X, type(switch)).
% initially, switch a is off and switch b is on
initialState(variable(on(constant(a))), value(on(constant(a)), false)).
initialState(variable(on(constant(b))), value(on(constant(b)), true)).
% in the end, switch a should be on and switch b should be off
goal(variable(on(constant(a))), value(on(constant(a)), true)).
goal(variable(on(constant(b))), value(on(constant(b)), false)).
```
When translating SAS or PDDL problems, `plasp` structures the translated ASP facts into multiple sections, which are explained in the following.
## Feature Requirements