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The WCM drive is used to expose as an isolated repository via the CMIS service. Operations on the repository will reflect the drive immediately.
When working with CMIS repositories, it is important to understand that a repository reflects a WCM Drive, which is a sub-tree in JCR workspace. Two or more drives can be mapped to a same workspace or a sub-tree. As a result, changes in one repository can affect others. Refer to the WCM drives mappings to know actual location of a content you will access or change.