The concept "storage directory" is undefined

[mr-c]

[jdidion]

I believe you're referring to https://github.com/openwdl/wdl/blob/1c2f801d03df9aca4d4984726c98c54874d9ed23/versions/1.1/SPEC.md#task-input-localization

[jdidion]

Is this more clear?

"Two input files that have the same parent location must be localized into the same directory for task execution. For example, http://foo.com/bar/a.txt and http://foo.com/bar/b.txt have the same parent (http://foo.com/bar/), so they must be localized into the same directory."

[mr-c]

Better. Still not very specific as to what parent means.

Also a good place to say that it is better to not depend on users organizing their inputs in a certain way, and that relying on this should be documented (if not avoided entirely)