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The mechanism of grouping related digital objects in the dLibra system is based on so-called group publications. Grouping related objects is used for, among other items, newspapers, journals, or multi-volume publications. Its result are complex objects – group publications (for example, a publication which groups all numbers of a newspaper from a given year). The structure of group publications is hierarchical, so more complex structures which group related objects can be created. On the website of a digital library, the reader can see a group publication and easily navigate its structure. It is also possible to determine the position order of particular objects in a group publication.
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