This repository contains php module and tests for him. The module allows you to record the changes made in xml documents, as well as restore a document on these changes, and forget changes in a specified index. At this point in time we are actively working to increase the capabilities of the module. The module is developed by request of the company Logics Development, headquartered in the city Irkustk.

• Can set new state or get any known state of a machine
• Can return range of indexes of all known states
• Can select next or previous or random index state
• Is able to confirm integrity of state machine
• Should be able to set checkpoint and forget all previous states of a machine
• New states are added to the end