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For each type of object that needs global access, create an object that can provide the illusion of an in-memory collection of all objects of that type. Set up access through a well-known global interface. Provide methods to add and remove objects, which will encapsulate the actual insertion or removal of data in the data store. Provide methods that select objects based on some criteria and return fully instantiated objects or collections of objects whose attribute values meet the criteria, thereby encapsulating the actual storage and query technology.

Then the model is passed on to the software developers. The developers might look at the model and discover that some of the concepts or relationships found in it cannot be properly expressed in code. So they use the model as the original source of inspiration, but they create their own design which borrows some of the ideas from the model, and adds some of their own. The development process continues further, and more classes are added to the code, expanding the divide between the original model and the 23 24│DOMAIN DRIVEN DESIGN QUICKLY final implementation.

It does not really matter what happens to those objects, because it won’t affect the integrity of the aggregate in any way. If objects of an Aggregate are stored in a database, only the root should be obtainable through queries. The other objects should be obtained through traversal associations. Objects inside an Aggregate should be allowed to hold references to roots of other Aggregates. The root Entity has global identity, and is responsible for maintaining the invariants. Internal Entities have local identity.

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