2.1) Repository Items:

• A repository is a collection of repository items. A repository item is a JavaBean component that implements atg.repository.RepositoryItem or one of its sub-interfaces, and corresponds to the smallest uniquely identifiable entity in the underlying data store. In the SQL repository, for example, a repository item often corresponds roughly to a row in a table. In the SQL profile repository, each user profile is a repository item.
• Each repository item is composed of named properties that store the item’s data—for example, id, firstName, and lastName. In the SQL repository, these properties generally correspond to table columns. Repository item properties are defined in its item descriptor.
• Each repository item must have an identifier, which is called a repository ID. The repository ID must uniquely differentiate the repository item from all other repository items of the same type.