Universal Data Models provided by connector map its collections to Universal Data Models and back.

They are stored in udm.yml file in the connector.

Example:

contacts:                            # Universal data model
  collectionMappings:                # How it maps to data collections in connector
    - key: contacts                  # Collection it maps to
      fieldsFromCollection:          # Mapping from collection fields to UDM (using formulas)
        id:
          $var: $.id
        fullName:
          $concat:
            values:
              - $var: $.firstName
              - $var: $.lastName
            delimiter: ' '
        firstName:
          $var: $.firstName
        lastName:
          $var: $.lastName
        # ... more mappings
      fieldsToCollection:            # Mapping from UDM fields to collection fields
        id:
          $var: $.id
        firstName:
          $var: $.firstName
        lastName:
          $var: $.lastName
        # ... more mappings