[Nexus] XAS with multiple absorbed_beam detectors

[Smith, William]

Dear NeXus community,

I would like to know how other people are approaching the following 
situation.

In an XAS measurement there are a minimum of two detectors. In the 
application definition these are named "incoming_beam" and "absorbed_beam".

In practice is it not uncommon to have many detectors measuring the 
absorbed beam. For example TEY (Total Electron Yield), TFY (Total 
Florescence Yield), and then N PFY (partial florescence yield) signals.

In the XAS application definition (and other similar app defs) there is 
only a single absorbed_beam entry under NXinstrument. 
https://manual.nexusformat.org/classes/applications/NXxas.html

Under the entry for DATA:NXdata is a field "mode" specifying which mode 
of detection is being used (TEY, TFY, PFY, Transmission etc)

I could make multiple NXentry in one file, which were each almost 
identical except with different entries for the NXdata which would 
connect to TFY or PFY or TEY signal etc,

Or

I could us NXsubentry to do the same

Or

I could use multiple NXdetector groups named something like 
absorbed_beam_TEY, absorbed_beam_TFY (this is my preference but doesn't 
comply with the application definition)

Thanks in advance for your help,

Will


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