... GPI Data Pipeline 1.0 documentation . ... Recipes and the Queue . ... The pipeline?s actions are controlled by ?Recipes? that specify input FITS files, various tasks (called ?primitives?) to run on them, and options or parameters for those tasks. ... For GPI, recipes are saved as XML files, and while they may be edited by hand, they are more easily created through the use of the Recipe Editor and Data Parser tools. ... The pipeline checks the queue for new recipes once per second by default. ...