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- In this example the root Item has a Persistent Identifier.
- The identifier MUST be an URI. Some repositories can make use of registered URIs, e.g., in the Netherlands the repositories can make use of National Bibliography Numbers. If a repository doesn't have access to registered URIs, UUIDs or TAGs can be used. More information about UUIDs can be found at http://en.wikipedia
Anchor _Hlt190750088 _Hlt190750088 Anchor _Hlt190750089 _Hlt190750089 .org/wiki/UUID and for TAGs the best starting point is http://www.taguri.org/. TAGs for the repository of Tilburg University could be constructed in the following way. All TAGs start with 'tag:uvt.nl,<year>:<record id>'. <year> is the year that the compound object entered the repository. The URIs for MODS records can look like 'tag:uvt.nl,<year>:<record id>/mods' and the URIs for object files can look like 'tag:uvt.nl,<year>:<record id>/<file id>'. - The identifiers of the root Item and the second level Item elements SHOULD NOT be equal to the OAI identifier or the DIDL document identifier.
- Identifiers should not change. Different identifier implies a different object.
- The namespace for dii SHOULD be declared in the DIDL tag.
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===== TO DO ===== |