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Specifying top-level actors:

The specification of the top-level actors of a data flow diagram must be initiated by the keyword toplevel:. The specification must be placed in the annotation of the represented function. The entry consists of an unique ID in the actor. Optional behind the ID can be any label in quotation marks. The entry must be terminated with a semicolon.

toplevel:ID "label";

Special case:

It is possible to force data flows in contrary to the general specifications . This is particularly the case when there are multiple top-level actors. The specification of data flows between these actors is set to the specifications of other data flows. For the specification, all predecessors of the actor and the actor itself, which define the source and target, must be specified by IDs. For the specification the path to the source and to the destination must be specified. Both are separated by a right-leaning arrow. A path consists of the ID of the source (or destination) and the ID of the actor, in which it is defined, and the IDs of all textual comprehensive actors. The ID of the defining actors is placed in front of the ID of the source (or destination) and separated by a colon. The IDs of the textual comprehensive actors, are arranged in descending order, placed in front of the ID of the defining actor. The IDs of all actors in the path are  separated from each other by an underscore q . Source and destination can differ in more than one hierarchical level. All characters that are replaced with underscores in an ID must also be replaced with underscores in the specifying.

link: source -> ID0_ID1_ID2_..._ID:target, ... ;