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Part II. Phased Implementation Plan for DMAC6.3.1.4. The primary and secondary archive centers storing irreplaceable data may operateas mirror sites, both offering the same level of access, or one as the exclusiveaccess center and the other as a “deep” back-up center (e.g., a regional data centercould serve as a secondary archive center).6.3.2. Replaceable Data6.3.2.1. The AA shall maintain one copy (residence time in the archive will vary withreplacement cycle).6.3.3. Perishable Data6.3.3.1. The AA shall maintain one copy until higher quality data are available.6.3.3.2. When decision-critical data products are derived from data in this class, and it isnecessary to reproduce the data product, the perishable data may inherit an extendedterm for data preservation that is not obvious for the original data alone.6.3.4. Virtual Data6.3.4.1. No copies of the data are necessary, but an archive center and the virtual dataprovider should maintain separate copies of generation software and documentation.6.4. Metadata. The AA shall maintain metadata as defined in Section 1, Metadata/Data DiscoveryRequirements, and will include the following types of metadata:6.4.1. Use metadata (the semantic and syntactic information about a data set);6.4.2. Discovery metadata (standard structured information describing a data set).6.4.2.1. Data set lineage history (e.g., which irreplaceable data set was used to create thiscurrent data set);6.4.2.2. Data category specification, which determines the storage requirements;6.4.2.3. Release date, which is the date to remove temporary restricted access;6.4.2.4. Version number and description of the version number;6.4.2.5. Description of the file naming convention;6.4.2.6. Unique IOOS-wide data set name or identification;6.4.2.7. Mechanisms for correct publication citation and reference tracking.6.4.3. Documentation metadata (bibliographic information about documentation associatedwith a data set).6.4.4. Metadata shall be dynamic to accommodate through numerous incremental updates,modifications, corrections, and occasionally, full replacements.6.4.5. Metadata shall be inclusive of sufficient information to provide an end-to-end lineagerecord, starting with the measurements or computation through the change and modificationhistory and eventually to established scientific or public knowledge.73