A class definition can contain a type section, const section and a variable section. The type and constant sections act as a regular type section as found in a unit or method/function/procedure implementation. The variables act as regular fields of the class, unless they are in a class var section, in which case they act as if they were defined at the unit level, within the namespace of the class (section 6.2, page 288).
However, the visibility of these sections does play a role: private and protected (strict or not) constants, types and variables can only be used as far as their visibility allows.
Public types can be used outside the class, by their full name:
Will not compile and will return an error: