Catmandu::Fix::Bind::list3pm

     # Create an array:
     #  demo:
     #    - red
     #    - green
     #    - yellow
     # Add a foo field to every item in the demo list, by default all
     # fixes will be in context of the iterated path. If the context
     # is a list, then '.' will be the path of the temporary context
     # variable
     do list(path:demo)
        if all_equal(.,green)
            upcase(.)
        end
     end
     # This will result:
     #  demo:
     #    - red
     #    - GREEN
     #    - yellow
     # Loop over the list but store the values in a temporary 'c' variable
     # Use this c variable to copy the list to the root 'xyz' path
     do list(path:demo,var:c)
        copy_field(c,xyz.$append)
     end
     # This will result:
     #  demo:
     #    - red
     #    - GREEN
     #    - yellow
     #  xyz:
     #    - red
     #    - GREEN
     #    - yellow