What does opensWholeDirectory="false" do in the XML file for databases?

[JustinPrivitera]

If it does what I think it does, can we enable it for ADIOS2?

[cyrush]

For some databases, there is no concept of a root file - they expect to open a directory and look for data in files in that directory to assemble the mesh metadata and data.
Users of these type of databases more naturally want to select a directory, not one of the files in it.

[JustinPrivitera]

Can we turn this on for ADIOS2 so that users don't need to keep making .visit files in order to open their .bp files (which present as directories)?