Validation of variables

[Torsten Reinhard]

Hi all,
We currently have all our configuration properties bundled with the application-and therefore its almost a big challenge to change some values.
I'm thinking now of extracting all those properties and configs - and move them to Ansible variables, var_files, inventory or whatever.
Is there any advanced feature in setting up those configuration values? How can I validate the values? Where can I put documentation about the meaning of the property? Any way to easyli generate documentation for those who needs to provide the values?
We have about 8 different environments (dev1-3,test1-3,preprod,prod) we all need to manage.
Any 3rd party library, Module or whatever recommended?
As far as I know Ansible is providing the basic operations like storing,reading and accessing variables but without any extended model behind where one can put those Metadata.

Any help or hint appreciated,

Thx Torsten