We are using this to implement a reusable comprehensive email templating module to prevent our having to hand-craft HTML emails out of many different IRIS applications.  So far the approach looks very promising!  (and members of the community will eventually be able to directly see the results as we're first using this to implement a Welcome Email framework which can be used by any of our externally facing applications which use InterSystems Login accounts - https://community.intersystems.com/post/leveraging-your-intersystems-log...