Is it possible to do metadata validation with Athento?

Athento SE allows multiple mechanisms for automated and manual metadata validation. 

Some of the metadata validation options are:

1. Validation if they comply with a given regular expression.
2. Validation if its content appears in another metadata or in the text of a document (useful, for example, to validate if the scanned ID of a person corresponds to the ID indicated in an application).
3. Validation against an external database.
4. Validation by calling a Web Service of another application.