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These entities are the only singletons in your domain if you generated your domain automatically. Conceptually, they represent the envelope of your message (remember Chapter 2 - . Simple Object Access Protocol (SOAP)). You can recognize these entities by their name. They are postfixed with either REQUEST or RESPONSE. These entities have no attributes and only one relation. In the code, Blueriq will start at this singleton, and work its way along the relation to all (indirectly) connected instances while creating the XML for the message. When sending a message, you have to make sure that this relation is set, otherwise the SOAP envelope will be empty.

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