Two-part versioning scheme
The Image Service API v2 follows the lead of the v1 API and use a major version and a minor version. For example, 'v2.3' would break down to major version 2 and minor version 3.
Backwards-compatibility
The interface will not be reduced with subsequent minor version releases, it will only be expanded. For example, everything in v2.1 will be available in v2.2.
Property Protections
Version 2.2 of the Images API acknowledges the ability of a cloud provider to employ property protections, an optional feature whereby CRUD protections may be applied to image properties. Thus, in particular deployments, non-admin users may not be able to view, update, or delete some image properties. Additionally, non-admin users may be forced to follow a particular naming convention when creating custom image properties. It is left to the cloud provider to communicate policies concerning property protections to users.
