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Parent TODOs should not be marked done until all TODO subtasks, or children tasks, are done. Further, sometimes there is a logical sequence to tasks and subtasks.
org-enforce-todo-dependenciesvariable such that Org blocks entries from changing state to DONE while they have TODO children that are not DONE.
if any entry has a property ’ORDERED’, each of its TODO children is blocked until all earlier sibligs are marked as done.