28 lines
2.1 KiB
Markdown
28 lines
2.1 KiB
Markdown
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# PDDL Feature Support
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This document describes the PDDL features are currently supported by `plasp`’s very own translator.
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This doesn’t cover PDDL feature support through SAS conversion with [Fast Downward](http://www.fast-downward.org/) (please refer to [Fast Downward’s homepage](http://www.fast-downward.org/) for more information).
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The table below lists the features of PDDL 3.1 and whether or not they are supported by `plasp`.
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Unless otherwise noted, this refers to `plasp`’s parser, normalizer, translator, and ASP output format.
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| PDDL feature | description | supported by `plasp` |
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|---|---|---|
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| STRIPS | basic STRIPS functionality, the general PDDL sections (`:domain`, `:problem`, `:predicates`, `:action`) | yes |
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| typing | typed variables and constants, type inheritance | yes (except for `either` type directives) |
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| negative preconditions | typed variables and constants, type inheritance | yes |
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| disjunctive preconditions | `or` expressions in preconditions | yes |
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| existential preconditions | `exists` expressions in preconditions | yes |
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| universal preconditions | `forall` expressions in preconditions | yes |
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| conditional effects | `when` expressions in action effects | yes |
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| universal effects | `forall` expressions in effects | yes |
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| equality | `=` expressions for atomic formulas | no (parser support only) |
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| numeric fluents | numeric function definitions in `:functions` section, assignment operators, arithmetic preconditions | no |
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| action costs | actions are assigned costs through numeric fluents | no |
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| durative actions | temporal planning with action durations | no |
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| derived predicates | predicates whose truth value is defined by a formula | no (`plasp` introduces *custom* derived predicates to support nested expressions, but derived predicates specified in the PDDL input are currently not supported) |
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| timed initial literals | initial state may specify literals that become true at a specified time point | no |
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| preferences | preferences in action preconditions and goals | no |
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| constraints | additional constraints for domain and problem | no |
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