# Package picard.cmdline.argumentcollections

- Interface Summary
  Interface | Description
  --- | ---
  IntervalArgumentCollection | Base interface for an interval argument collection.
  OutputArgumentCollection | Base interface for an output argument collection.
  ReferenceArgumentCollection | Base interface for a reference argument collection.

- Class Summary
  Class | Description
  --- | ---
  EmptyOutputArgumentCollection |
  OptionalReferenceArgumentCollection | Picard default argument collection for an optional reference.
  RequiredOutputArgumentCollection |
  RequiredReferenceArgumentCollection | Argument collection for references that are required (and not common).