For mobile drivers licenses in ISO 18013-5, the credential is a signed list of salted hashes, each representing a distinct named attribute. You release the cred

For mobile drivers licenses in ISO 18013-5, the credential is a signed list of salted hashes, each representing a distinct named attribute. You release the credential as well as whatever attributes which were requested. You can disclose your full name and your birth date, or just the boolean value that you are over 21, depending on the use case. Of course, many of these scenarios would be more logically served with a digital version of a national ID card or passport, but some countries use driving licenses in lieu of such concepts.