e.g.
I created mse and mse.raw
Axis classes under raw show up as:
In [5]: nstx.s201952.mse.raw.raw01._ class _
Out[5]: fdf.factory.SignalMseRaw
In [6]: nstx.s201952.mse.raw.raw01.time._ class _
Out[6]: fdf.factory.AxisRaw
I think the Axis signals also need the full expanded tree names, I can see several diagnostics having identically named subcontainers.