When clients pass a value of this structure as a parameter, the field must be an identifier for the resource type: com.vmware.appliance.update.history. When operations return a value of this structure as a result, the field will be an identifier for the resource type: com.vmware.appliance.update.history.

Defines the severity of the issues fixed in the update. Warning: This enumeration is part of a new feature in development. It may be changed at any time and may not have all supported functionality implemented. Value is one of:
CRITICAL: Vulnerabilities that can be exploited by an unauthenticated attacker from the Internet or those that break the guest/host Operating System isolation. The exploitation results in the complete compromise of confidentiality, integrity, and availability of user data and/or processing resources without user interaction. Exploitation could be leveraged to propagate an Internet worm or execute arbitrary code between Virtual Machines and/or the Host Operating System. Warning: This constant is part of a new feature in development. It may be changed at any time and may not have all supported functionality implemented.
IMPORTANT: Vulnerabilities that are not rated critical but whose exploitation results in the complete compromise of confidentiality and/or integrity of user data and/or processing resources through user assistance or by authenticated attackers. This rating also applies to those vulnerabilities which could lead to the complete compromise of availability when exploitation is by a remote unauthenticated attacker from the Internet or through a breach of virtual machine isolation. Warning: This constant is part of a new feature in development. It may be changed at any time and may not have all supported functionality implemented.
MODERATE: Vulnerabilities where the ability to exploit is mitigated to a significant degree by configuration or difficulty of exploitation, but in certain deployment scenarios could still lead to the compromise of confidentiality, integrity, or availability of user data and/or processing resources. Warning: This constant is part of a new feature in development. It may be changed at any time and may not have all supported functionality implemented.

Defines update type. Warning: This enumeration is part of a new feature in development. It may be changed at any time and may not have all supported functionality implemented. Value is one of:
SECURITY: Fixes vulnerabilities, doesn't change functionality. Warning: This constant is part of a new feature in development. It may be changed at any time and may not have all supported functionality implemented.
FIX: Fixes bugs/vulnerabilities, doesn't change functionality. Warning: This constant is part of a new feature in development. It may be changed at any time and may not have all supported functionality implemented.
UPDATE: Changes product functionality. Warning: This constant is part of a new feature in development. It may be changed at any time and may not have all supported functionality implemented.
UPGRADE: Introduces new features, significantly changes product functionality. Warning: This constant is part of a new feature in development. It may be changed at any time and may not have all supported functionality implemented.