This collection deals with higher-level ideas such as the
Designer Interface, as part of LaTeX3 developments. The
packages here have over time migrated into the LaTeX kernel:
the material here is retained to support older files. The
appropriate LaTeX kernel releases incorporating the ideas from
the packages here are l3keys2e 2022-06-01 xfp 2022-06-01 xparse
2020-10-01 xtemplate 2024-06-01