| standard library package CausationConnections { | |
| doc | |
| /* | |
| * This package provides a library model modeling causes, effects, and causation connections | |
| * between them. | |
| */ | |
| private import SequenceFunctions::isEmpty; | |
| private import SequenceFunctions::size; | |
| private import SequenceFunctions::intersection; | |
| abstract occurrence causes[*] { | |
| doc /* Occurrences that are causes. */ | |
| } | |
| abstract occurrence effects[*] { | |
| doc /* Occurrences that are effects. */ | |
| } | |
| abstract connection def Multicausation { | |
| doc | |
| /* | |
| * A Multicausation connection models the situation in which one set of | |
| * occurrences causes another. | |
| * | |
| * To create a Multicausation connection, specialize this connection definition | |
| * adding specific end features of the relavent types. Ends representing causes | |
| * should subset 'causes', while ends representing effects should subset 'effects'. | |
| * There must be at least one cause and at least one effect. | |
| */ | |
| ref occurrence causes[1..*] :>> causes :> participant { | |
| doc /* The causing occurrences. */ | |
| } | |
| ref occurrence effects[1..*] :>> effects :> participant { | |
| doc /* The effect occurrences caused by the causing occurrences. */ | |
| } | |
| private assert constraint disjointCauseEffect { | |
| doc /* causes must be disjoint from effects. */ | |
| isEmpty(intersection(causes, effects)) | |
| } | |
| private succession causalOrdering first causes.startShot[nCauses] then effects[nEffects] { | |
| doc /* All causes must exist before all effects. */ | |
| attribute nCauses = size(causes); | |
| attribute nEffects = size(effects); | |
| } | |
| } | |
| abstract connection multicausations : Multicausation[*] { | |
| doc /* multicausations is the base feature for Multicausation ConnectionUsages. */ | |
| } | |
| connection def Causation :> Multicausation { | |
| doc | |
| /* | |
| * A Causation is a binary Multicausation in which a single cause occurrence | |
| * causes a single effect occurrence. (However, a single cause can separately | |
| * have multiple effects, and a single effect can have separate Causation | |
| * connections with multiple causes.) | |
| */ | |
| end occurrence theCause[*] :>> causes :>> source { | |
| doc /* The single causing occurrence. */ | |
| } | |
| end occurrence theEffect[*] :>> effects :>> target { | |
| doc /* The single effect occurrence resulting from the cause. */ | |
| } | |
| } | |
| abstract connection causations : Causation[*] :> multicausations { | |
| doc /* causations is the base feature for Causation ConnectionUsages. */ | |
| } | |
| } |