1.18.1 Collection hierarchy

A digital collection can contain several hierarchy levels of subcollections.

Each record can belong to any number of collections. It is also not possible to belong to a collection.

If a record is assigned to at least one collection, this information is stored in the DC (DigitalCollection) field of the index. The entries in this field always consist of a text string, which may be divided into several hierarchy levels for the collection by a separator:


The character string interpreted as a separator (in the above example, a period) can be changed individually for each hierarchical field using the following configuration element:

    <collection field="DC">

It should be noted that the names of the individual hierarchy levels themselves must not contain the separator character, since otherwise a subdivision also takes place in these places.

The translation of the example given above for an intuitive collection tree in the messages files looks as follows:

science.mathematics.algebra.algebra1800to1900=Algebra 1800 to 1900

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