Inputs and Outputs

The dependencies are represented by connectors between files and jobs.

The connectors go from files to jobs for inputs and from jobs to files for outputs. For a job, the notion of its inputs and outputs is obvious. We extend the same notion to files: the "outputs of a file" are all the jobs that use the file as input; the "inputs of a file" are all the jobs that contribute to creating the file. Normally, each file has either zero or one input.

A primary input is a node that has no inputs. Similarly a primary output is a node that has no outputs. In the attached diagram, the files aa and cp are primary inputs and the files cc and dd are primary outputs.

Connectors have no attributes.



Figure 1. A Small Flow Shows Dependencies Between Files and Jobs