reference for bexis template

[fdschneider]

@aostrow
A sub-folder 'bexis' now holds information for the BExIS trait template. The XML template in this folder should be updated every time the BExIS template is updated to the current version of ETS.

You could also drop your script for producing the XML template here, or we create an R-based script to produce the new version of the template any time the ETS reaches a new release.