PRs will introduce various mechanisms step by step. Some of these have issues already. A possible breakdown could be: Annotation collection using instance values (links also does this) Defining annotations to which multiple keywords contribute (this is new, see Need more details of annotation collection #530) Defining subschema and keyword processing results to include annotations Processing sequence for keywords that dynamically rely on the results of static keywords The actual definition of unevaluatedProperties An example of unevaluatedProperties