An Edition is the manifestation of a work. An Edition is a special kind of an Aggregation, its metadata contains fields to describe, e.g. the people and organisations involved in preparing the edition or the source (outside TextGrid, e.g. a book) that the electronic edition represents. An Edition is usually associated with a Work and it has to be so for publication. The actual content of an Edition is stored in the Item Objects the Edition aggregates. Editions can be published if they have correct metadata, are associated with a Work, and contain at least one Item. The Edition Object provides the precise structure for the publishing of Items.