* Please add useful, if vague, comments for toString overrides.

* Provide overrides for methods to give method-specific information in subclasses; for example "kind()". 

I cannot see significant examples of the latter other than kind(), which on leaf classes document the return of a specific Kind.

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For the Snippet subclasses, many of them say something like:
>
> Snippet for a method definition. The Kind is Snippet.Kind.METHOD. 

The best place to say what Method.Snippet.kind() does is for javadoc for the Method.Snippet.kind() method :-)

I strongly recommend creating overrides of the methods in the implementation expressly for the purposes of hosting the javadoc; e.g.

/**
 * Returns Snippet.Kind.METHOD.
 * @return Snippet.Kind.METHOD
 */
@Override
public Snippet.Kind kind() {return super.kind();}

The javax.lang.model API does this for its interfaces and classes.