# Is the structure of the YAML namelists for main applications (variational, hofx) fixed or it still might evolve with future OOPS developments?

**URL:** <https://forums.jcsda.org/t/is-the-structure-of-the-yaml-namelists-for-main-applications-variational-hofx-fixed-or-it-still-might-evolve-with-future-oops-developments/144>\
**Category:** Academy\
**Created:** [August 31, 2021, 7:09pm UTC](https://forums.jcsda.org/t/is-the-structure-of-the-yaml-namelists-for-main-applications-variational-hofx-fixed-or-it-still-might-evolve-with-future-oops-developments/144 "2021-08-31T19:09:02Z")\
**Posts on this page:** 1\
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**Author:** ![kshan](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.jcsda.org/kshan/32/86_2.png) [@kshan](https://forums.jcsda.org/u/kshan)\
**Post date:** [August 31, 2021, 7:09pm UTC](https://forums.jcsda.org/t/is-the-structure-of-the-yaml-namelists-for-main-applications-variational-hofx-fixed-or-it-still-might-evolve-with-future-oops-developments/144/1 "2021-08-31T19:09:02Z")

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It’s mostly fixed, we haven’t made any drastic changes for a long time. The top structure is fairly stable and the more you go down, the more it changes often.