A useful feature would be a cache of the compiled DFDL schema so that the penalty
to compile it isn't being paid every time you run the XSLT. (Something many
usages of Daffodil need - probably should be a feature supplied in a Daffodil
library so that it's not being reinvented.) Daffodil compilation times are
acceptable now for long-running processes, but not for quick start/stop things
as XSLT commonly is.