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There is a newer version: 1.3.3

"An annotation that may occur at most once at a given 
 program element and only on certain program elements.
 
 An optional annotation is declared simply by having the 
 annotation class satisfy `OptionalAnnotation` instead of 
 [[Annotation]]. For example the following would only be 
 allowed on `class` declarations:
 
     final annotation class ExampleClass() 
             satisfies OptionalAnnotation {}
 
 At runtime a [[ceylon.language.meta.declaration::Declaration]] 
 instance can be queried for its `OptionalAnnotation`s of a 
 certain type using [[ceylon.language.meta::annotations]] or 
 [[ceylon.language.meta::optionalAnnotation]]."
see(`interface Annotation`)
shared interface OptionalAnnotation
        of Value
        satisfies ConstrainedAnnotation
            
        given Value satisfies OptionalAnnotation
            
        given ProgramElement satisfies Annotated {}