Specification of the data flow(s) to be visualized.

Item Summary
Name	Type	Multiplicity	Description
item	property ItemPathType	[0,-1]	Initial set of items to be shown.
lookBackward	property boolean	[0,1]	Whether to look backward i.
lookForward	property boolean	[0,1]	Whether to look forward i.

Items
- item
  
  Flags: RAM,runtime
  
  Multiplicity: [0,-1]
  
  Display order:
  
  Initial set of items to be shown.
- lookBackward
  
  Flags: RAM,runtime
  
  Multiplicity: [0,1]
  
  Display order:
  
  Whether to look backward i.e. to the source(s) for specified item(s).
- lookForward
  
  Flags: RAM,runtime
  
  Multiplicity: [0,1]
  
  Display order:
  
  Whether to look forward i.e. to the target(s) derived from specified item(s).