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Documented axiom rules.

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Patrick Lühne 2016-08-14 16:07:45 +02:00
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doc/output-format.md
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@ -104,7 +104,7 @@ action(action(<name>)).
% defines that as a precondition to <action>, <variable> must have value <value> % defines that as a precondition to <action>, <variable> must have value <value>
precondition(<action>, <variable>, <value>). precondition(<action>, <variable>, <value>).
% defines that after executing <action>, <variable> is assigned <value> % defines that after applying <action>, <variable> is assigned <value>
postcondition(<action>, effect(<number>), <variable>, <value>). postcondition(<action>, effect(<number>), <variable>, <value>).
% defines the condition of a conditional effect % defines the condition of a conditional effect
@ -175,5 +175,28 @@ contains(<mutex group>, <variable>, <value>).
SAS contains information about mutually exclusive [variable](#variable) assignments. SAS contains information about mutually exclusive [variable](#variable) assignments.
That is, *at most one* variable assignment of each mutex group must be satisfied at all times. That is, *at most one* variable assignment of each mutex group must be satisfied at all times.
Mutex group facts are only present with SAS input programs and not PDDL.
Mutex groups contain essential information in order to find plans correctly. Mutex groups contain essential information in order to find plans correctly.
That is, if mutex groups are present in `plasp`’s output, they have to be accounted for appropriately. That is, if mutex groups are present in `plasp`’s output, they have to be accounted for appropriately.
### Axiom Rules
```prolog
% declares an <axiom rule>
axiomRule(axiomRule(<number>)).
% defines that as a precondition to <axiom rule>, <variable> must have value <value>
precondition(<axiom rule>, <variable>, <value>).
% defines that after applying <axiom rule>, <variable> is assigned <value>
postcondition(<axiom rule>, <variable>, <value>).
```
Axiom rules are similar to [actions](#actions) in that they modify variables if certain preconditions are satisfied.
However, axiom rules must be applied *immediately* as soon as their preconditions are satisfied.
Axiom rule facts are only present with SAS input programs and not PDDL.
Axiom rules contain essential information in order to find plans correctly.
That is, if axiom rules are present in `plasp`’s output, they have to be accounted for appropriately.