Open Stack

Hi,

I am a little confused about the cell hierarchy in openstack. The blueprint
and the docs state that cells can be arranged in a tree-structure and that
there may be multiple parents for a child.
Does this mean that there can be multiple levels of cells in a setup or
there can be multiple parents for the same cell
If cells can indeed be arranged like a tree -  Parent-Child-Grandchild, is
the "Child" configured as as "compute" or "api" cell?
If a cell can have multiple parents how would that work in practice?

Regards,
Dheeraj
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