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"Open Information Management" (OIM) means managing information so that it is open to processing by any program, not just the program that created it. That extends even to application programs not conceived of at the time the information was created.
OIM is based on the principle of data independence: data should be stored in computers in non=proprietory, genuinely standardized representations. And that applies even when the data is the content of a document. Its representation should distinguish the innate information from the proprietary codes of document processing programs and the atifacts pf particular presenation styles.