An Edition is the manifestation of a work. An Edition is a special kind of an Aggregation, and its metadata contains fields to describe, for example, the people and organizations involved in preparing the edition or the source (outside TextGrid, e.g. a book) that the electronic edition represents. An Edition is often associated with a Work in its pre-publication form and it must be associated with a Work for publication. The actual content of an Edition is stored in the Item Objects which 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.