unfolding structure names

[CdeMills]

Hello,

I would like to make easier to obtain a representation of some complex
structure. Let's say that
a = struct('a', 1, 'b', 2)
a.c=struct('val', 42, 'sigma', 1e-4)
'a' is thus a structure containing many fields, including another structure.
How can I unfold it to construct 
- a list of names as
 'a', 'b', 'c.val', 'c.sigma'
- a vector which is the  concatenation of every numeric values ?
The idea is to construct an unique trajectory, such that all field names and
all values are visited exactly once and in the same order ?

Regards

Pascal

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