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WebDAV: Get the list of principals (users)
TElWebDAVServer.PrincipalCollectionSet() method is used to get a list of principal collections.
Once the list of collections is obtained, you can call TElWebDAVClient.ListPrincipals() method for each collection to retrieve a list of principals at any depth. The method returns result as TElWebDavPrincipalList filled with TElWebDavPrincipal objects. Each TElWebDavPrincipal object represents a single principal.