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Documented constants and objects.

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Patrick Lühne 2016-08-14 15:29:27 +02:00
parent 2281cd1cd4
commit 7a63e4abb9
1 changed files with 21 additions and 3 deletions
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doc/output-format.md
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@ -64,11 +64,11 @@ The feature requirement predicates may be used in meta encodings to warn about u
% declares a <type> % declares a <type>
type(type(<name>)). type(type(<name>)).
% specifies <object> to be of type type(<name>) % specifies <constant> to be of type type(<name>)
has(<object>, type(<name>)). has(<constant>, type(<name>)).
``` ```
[Variables](#variables), [constants](#constants), and [objects](#objects) may be typed. Types are only available with PDDL and if typing is enabled. [Variables](#variables), [constants](#constants-objects), and [objects](#constants-objects) may be typed. Types are only available with PDDL and if typing is enabled.
### Variables ### Variables
@ -80,6 +80,9 @@ variable(variable(<name>)).
contains(<variable>, <value>). contains(<variable>, <value>).
``` ```
`plasp`’s variables represent the current state of the planning problem.
Variables are linked to the problem's [objects](#constants-objects) and [constants](#constants-objects).
With SAS, variable names are numbers starting at 0, `variable(<number>)`. With SAS, variable names are numbers starting at 0, `variable(<number>)`.
SAS variables are inherently multivalued, which results in two or more values of the form `value(<SAS predicate>, <bool>)` for each variable. SAS variables are inherently multivalued, which results in two or more values of the form `value(<SAS predicate>, <bool>)` for each variable.
@ -114,3 +117,18 @@ The conditions of conditional effects are given by additional `precondition` fac
Unconditional effects are identified with `effect(unconditional)`. Unconditional effects are identified with `effect(unconditional)`.
Conditional effects are currently only supported with SAS input problems. Conditional effects are currently only supported with SAS input problems.
### Constants/Objects
```prolog
% define a <constant> or object
constant(constant(<name>)).
% specifies <constant> to be of type type(<name>)
has(<constant>, <type>).
```
Constants and objects are the entities that are affected by [actions](#actions), for instance, the blocks in a Blocks World problem.
Constants are global for a domain, while objects are problem-specific.
`plasp` does not distinguish between the two, as both are identically used static identifiers.