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Besides Item, Edition and Work, the TextGrid metadata schema4  provides for a fourth object type, the Collection. Not unlike the Edition object, a Collection is also modelled as an Aggregation, but with a more generic, non-bibliographic metadata set. For instance, a Collection can be used to aggregate non-bibliographic objects (or mash up bibliographic and non-bibliographic Items) and assign them to a common temporal or spatial scope – or even provide a description for this selection.