activity edge
A sequencing relationship between two activity nodes, possibly including data.
Semantics
An activity edge is a sequencing relationship between a source activity node and a target activity node. The target node cannot execute until the source node has completed execution and emitted a token onto the activity edge. If a node has multiple edges of which it is the target, it cannot execute until all of them have tokens, unless the rules for the particular kind of activity node specify that a subset of input edges may enable execution. An edge may represent simple flow of control (control flow) or it may represent the flow of data (data flow), including the implicit flow of control that indicates that the data value has been produced. ...
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