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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. Group publications are visible on the web pages On the website of a dLibra digital library. Their hierarchical organization facilitates navigation and makes it possible to find , the reader can see a group publication and easily navigate its structure. It is also possible to determine the position of particular objects in a group publication.
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