Mistral, an OpenStack workflow service, defines several common workflow attributes. These include 'Type', which specifies the structure of the workflow, 'Output', which defines what information the workflow produces upon completion, and 'Input', which specifies what data is required to start the workflow. 'Workflow-meta' is not a standard attribute; it should be correctly referenced as 'workflow_meta' according to common usage, hence 'Workflow-meta' is not a common workflow attribute defined by Mistral.