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The Perform action is a referential ActionUsage referencing a performed action. This can be done explicitly or not.
If the performed action is explicitly specified the keyword perform alone is used in the textual representation.
Whereas the keywords perform action are used to denote that the performed action is this action itself.
Even if the perform action in one single SysML concept, we manage it differently whenever the the reference is explicit or not.
perform element
This PerformActionUsage explicitly references another action usage which should be specified with a dedicated tool.
Example:
action a1 { ... }
...
perform a1;
This perform action has the following graphical representation:
The content of the action itself is not displayed inside the perform action element, since it is only a reference to the actual action usage.
perform action element
In this case, the performed action is not another action, it is the action itself. Therefore, we don't need to specify it.
Example:
perform action a1 {
action subAction;
}
This perform action has the following graphical representation:
This perform action should be displayed with a regular action with all contained elements.
Semantic representation
Both different perform actions are stored as a PerformActionUsage element.
In case the perform action references another action this element has a ReferenceSubsetting relationship with the referencedFeature set properly to point to the other action usage (directly or not).
Description
The Perform action is a referential
ActionUsagereferencing a performed action. This can be done explicitly or not. If the performed action is explicitly specified the keywordperformalone is used in the textual representation. Whereas the keywordsperform actionare used to denote that the performed action is this action itself. Even if the perform action in one single SysML concept, we manage it differently whenever the the reference is explicit or not.performelementThis
PerformActionUsageexplicitly references another action usage which should be specified with a dedicated tool.Example:
This perform action has the following graphical representation:
The content of the action itself is not displayed inside the perform action element, since it is only a reference to the actual action usage.
perform actionelementIn this case, the performed action is not another action, it is the action itself. Therefore, we don't need to specify it.
Example:
This perform action has the following graphical representation:
This perform action should be displayed with a regular action with all contained elements.
Semantic representation
Both different perform actions are stored as a
PerformActionUsageelement. In case the perform action references another action this element has aReferenceSubsettingrelationship with thereferencedFeatureset properly to point to the other action usage (directly or not).