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The mapping between resource identifiers and resources is required to be stable for the lifetime of a system, that is, for
as long as there are active clients or data providers operating in the same context. In practice this may mean that a data
provider must make its resource identifiers persistent in case it is restarted during the lifetime of the system.
However, this is the minimum standard of persistence. The resource identifier design is intended to support implementations
that want to permanently assign identifiers to resources.