root:
             version = v1
             creates   file:./
             creates   file:plan.py
             creates   step:./plan.py

file:plan.py
                path = plan.py
               state = STATIC
          created by   root:
            consumes   file:./
            supplies   step:./plan.py

file:./
                path = ./
               state = STATIC
          created by   root:
            supplies   (file:first.txt)
            supplies   file:plan.py
            supplies   file:second.txt
            supplies   file:third.txt
            supplies   step:./plan.py
            supplies   step:cp -v first.txt second.txt

step:./plan.py
             workdir = ./
             command = ./plan.py
               state = SUCCEEDED
          created by   root:
            consumes   file:./
            consumes   file:plan.py
             creates   step:cp -v first.txt second.txt

step:cp -v first.txt second.txt
             workdir = ./
             command = cp -v first.txt second.txt
               state = PENDING
          created by   step:./plan.py
            consumes   file:./
            consumes   (file:first.txt)
             creates   file:second.txt
             creates   file:third.txt
            supplies   file:second.txt
            supplies   file:third.txt

(file:first.txt)
                path = first.txt
               state = PENDING
            consumes   file:./
            supplies   step:cp -v first.txt second.txt

file:second.txt
                path = second.txt
               state = PENDING
          created by   step:cp -v first.txt second.txt
            consumes   file:./
            consumes   step:cp -v first.txt second.txt

file:third.txt
                path = third.txt
               state = VOLATILE
          created by   step:cp -v first.txt second.txt
            consumes   file:./
            consumes   step:cp -v first.txt second.txt
