| Command-class | Virtual Command Class |
| Operation-class | Operation: A Simple Command Implementation |
| Pipeline-class | Pipeline: A Sequence of Protocols |
| PipelineData-class | PipelineData: Data with history |
| Protocol-class | Protocol: Concrete Step in a Pipeline |
| setProtocol | Define a Protocol Type |
| setStage | Define a Stage Class |
| Stage-class | Stage: Abstract Step in a Pipeline |
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