Annotation Constructors: abstract()

The annotation class for the `abstract()` annotation.

- `Anything`
  - `Object`
    - `Basic` ...and other supertypes
      - `AbstractAnnotation` ...and other supertypes

- `AbstractAnnotation`
  - `Basic`
    - `Identifiable`
    - `Object`
      - `Anything`
  - `OptionalAnnotation`
    - `ConstrainedAnnotation`
      - `Annotation`

no subtypes hierarchy

Initializer
`AbstractAnnotation()`

Inherited Attributes
Attributes inherited from: `Object` `hash`, `string`

Inherited Methods
Methods inherited from: `Object` `equals()`