# returns the arvados UUID of the underlying object
end
+ def parent
+ # returns the parent uuid of this work unit
+ end
+
def children
# returns an array of child work units
end
# returns true if this work unit can be canceled
end
+ def confirm_cancellation
+ # returns true if this work unit wants to use a confirmation for cancellation
+ end
+
def uri
# returns the uri for this work unit
end