The LibraryItems service provides operations to deploy virtual machines from library items containing virtual machine templates, as well as operations to create library items containing virtual machine templates. The LibraryItems service also provides an operation to retrieve information about the template contained in the library item.
The CheckOuts service provides operations for managing the checkouts of a library item containing a virtual machine template. This service provides operations to check out a library item to update the virtual machine template, and to check in the library item when the virtual machine changes are complete.
The Versions service provides operations for managing the live versions of the virtual machine templates contained in a library item. Live versions include the latest and previous virtual machine templates that are available on disk. As new versions of virtual machine templates are checked in, old versions of virtual machine templates are automatically purged. Currently, at most one previous virtual machine template version is stored.