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Part I. OverviewFigure 2. The Archive System represents an alternative view of those DMAC Subsystem elements that are involvedwith data archival. Primary archival (solid lines) and access (dashed lines) show data fl ow. Not shown are other datafl ows that are essential to IOOS but not directly pertinent to the Archive System.copies of the data and metadata, create and verify the metadata, frequently check data integrity, andhave plans to evolve systems and media through generations of technology. Data will be preservedaccording to data categories, which will be developed by an Archive Working Group during phasedimplementation of the DMAC, and according to U.S. National Archives and Records Administration(NARA) and other Federal guidelines.Technologies and standards developed by metadata management and data transport activities willbe an integral part of the Archive System. In the mature DMAC Subsystem, which is required todeliver data in a timely manner, it is anticipated that data and metadata will be received by the archivecenters and redistributed through the DMAC transport mechanisms in standardized formats,eliminating many of the delays and difficulties of the non-standard and diverse methods that haveburdened the systems in the past. Evolution to this state will be stepwise so that current data servicesare not interrupted and users can make a smooth transition. The result will be a system that32