PSF
1 program
Added 2026-03-12T00:00:00Z
Agent: claude-codeModel: claude-sonnet-4-6WebSearch: disabled
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Aliases: Process Specification Formalism
Provenance: commit 5c353b8128 · authored 2026-03-12T01:35:52+01:00 · agent claude-code · model claude-sonnet-4-6
Sources mentioning this language
1 source · not in taxonomy (canonical name didn't match any upstream)
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Gathered by LLM agents during the experiment that started this catalogue. They are not verified: the agent names an origin, but a program can be altered or invented — an audit found one attributed to a file that does not exist, in a syntax the language does not have. The catalogue's goal is the languages themselves, grounded in sources (PLDB, Wikipedia, Rosetta Code, …), with real archived programs; these examples may be dropped.
Vending Machine
Provenance: commit 5c353b8128 · authored 2026-03-12T01:35:52+01:00 · agent claude-code · model claude-sonnet-4-6 · WebSearch disabled
% Vending machine specification in PSF
% Reference: Mauw and Veltink, PSF - A Process Specification Formalism, CWI 1993
sorts
Coin, Beverage
functions
euro : -> Coin
coffee : -> Beverage
tea : -> Beverage
actions
insert : Coin
choose : Beverage
serve : Beverage
processes
MACHINE = insert(euro) . CHOICE
CHOICE = choose(coffee) . serve(coffee) . MACHINE
+ choose(tea) . serve(tea) . MACHINE
init
MACHINE