- allows to have dynamic definition of attributes depended on the
  instance
- there was no real need for it to be static. Places that used it static
  have been refactored.

fixes #1318

fixes #1246

issue #1246

also made everything conistent with client validation

- added example code for application components
- added missing short description

[ci skip]

fixes #991

also fixed some inconsistency between client and server validation.

fixes #845