Hi,

Another comment/suggestion on the file format...

Our system has 'standard' detectors, and 'proximity' detectors. The proximity detectors are meant to be use to record the surface physiology with short-separation measurements.
The current definition of 'ml' allows to define a measurement using its source/wavelength index, and its detector index.

How could we specify here if the detector index refers to the ith detector, or the ith proximity detector? Add a 'detectorType'?

If I could bring up another issue...
Our system also uses a modular concept, where the full system is the combination of multiple smaller 8-channel modules.
This could also apply to systems that could be combined (e.g. using 2 system to add more measurements).
What if I want to pair a detector from a module/system, to the detector of another module/system?

In its most complex form, I would see 'ml' as 
- detector module index
- detector type
- detector index
- source module index
- source index
- wavelength index

I know this would add complexity, but I am trying to make sure that no information is lost if this data format is used for export.

Thank you,

Mathieu