Many objects can bear some form of certification, Organizations can be ISO certified, Food products can be Organic or Vegan, a person can be a certified professional. There are certifications for many domains: regulatory, organizational, recycling, food, efficiency, educational, ecological, etc.

Certifications can be first party (the certification authority makes the claim), second-party (an authorized party makes the claim), or self-certification (recipient of the certification makes the claim). Some certifications have a unique identifier, for instance the FSC (Forest Stewardship Council).

Some schema.org objects have support for some specific certifications, for instance Product has hasEnergyConsumptionDetails, Person and Organization have hasCredential, but these are very specific. Adding specific attributes for all possible certification is not feasible.

A certification would be an object with the following properties:

• A certification unique identifier
• A certification authority
• A certifying organization (for second party)
• A certification measurement (energy efficiency, CO² emissions).
• The object of the certification (could be about).

Certification could descend from CreativeWork