The Hidden control allows an attribute to be included in a form but not display to the end user. For example, when implementing actions and validations it is necessary to include controls that should not be visible to the user.
Actions and validations are implemented in the form where they are executed. Consequently the attributes they reference will be added to the form. Use this control if you need to perform a validation over an attribute and the given attribute is not for display.
Related to attribute types
The control may relate to any kind of attribute.