[Obscore Update v1.1] an attempt to describe the Redshift Axis

[Louys Mireille]

Dear DMers, dear all,

Here is an attempt to add Redshift Axis description in the Obscore Data 
model summary table.

I suggest to use /d_/  as the prefix for _/doppler /_measurement.
DopplerAxis is another word for Redshift Axis , but seemed general enough.
The doppler features roughly have the same kind of list structure as the 
spectral axis list items in Obscore.

The definition of the Doppler axis is included , plus the reference of 
phase origin. (green lines in the table)

This raises the question of other axis reference positions , which were 
not included explicitely  in the previous Obscore recommendation, but 
defined implicitely by default ( ICRS, TT, TOPOCENTER) I suppose. Please 
correct me if I am wrong.

Here is my question to the WG:
Would it be sufficient instead to combine all the reference positions of 
the various axes together via the /coord_system_id/ defined in the STC 
recommendation at Appendix C1. for AstroCoordinateSystem ID .

It seems to me that <AstroCoords 
coord_system_id="TT-GAL-RADIO-LSR-TOPO"> as used in the STC example 
ARECIBO appendix C of the STC recommendation , tells all the reference 
stamps necessary for the various coordinate frames.
Am I wrong?

If this would work then
- only one reference to the appropriate coord_system_id might spare the 
various references and definitions on each axis.
- we could have a default coord system id definition for data discovery.

Comments , questions welcome ...
Cheers , Mireille
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