[Nexus] Split datasets?

[Benjamin Watts]

Hi Everyone,
    One of our beamlines wants to write write data into a 
Nexus-compatible file. The problem is that the hardware/software 
combination is a bit strange and wants to write the data in pieces. This 
is an XRF detector used in a scanning experiment such that a spectrum is 
recorded for each step along the scan. The detector wants to fill up its 
buffer with scans and then dump them into an HDF5 dataset. If it would 
just append to a single dataset then it would be fine, but no that 
doesn't seem to work. Do we have a scheme in NeXus for describing how a 
set of datasets should be appended together when reading? I feel like we 
discussed a similar issue previously with a very fast 2D detector that 
would write data in sets of ~100 frames into separate files that would 
be linked to by a master file. I haven't been able to find anything on 
the topic - does anyone else remember further details?

Thanks,
Ben