Service that allow to manage JSON schema.
Object which represents a JSON schema, it's a wrapper because it contains some additional info used by the
Service layer of Unomi like the id and the target.
Just a bean wrapping JSON Schema validation messages to avoid exposing the lib classes to other OSGI bundles.
This Exception is throw only when a validation process failed due to unexpected error
Or when we can't perform the validation due to missing data or invalid required data