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The recording capability of the Cameo Simulation Toolkit Magic Model Analyst allows you to:

• record created objects as CreateMessages connected between Lifelines that represent the object creator and features of the created object respectively.
• record signals as SendMessages connected between Lifelines that represent signal senders and signal receivers respectively. Connectors will be assigned to the messages if signals are sent via ports or connectors.
• record operation calls as CallMessages connected between Lifelines that represent operation callers and operation owners respectively. Connectors will be assigned to messages if operations are called via ports.
• record changes of states and primitive values as StateInvariants on Lifelines that represent features of objects that own the states or the values. 

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Whenever you simulate a model (such as Flashing Light as shown in the figure above), Cameo Simulation Toolkit Magic Model Analyst will:

• create the first Lifeline, which represents the selected runtime object.
• record each signal sent from the selected runtime object as a Message in the sequence diagram.
• record each operation call caused by a call message, a CallOperationAction, or an ALH.callOperation with argument and return value as messages in the sequence diagram.
• record an object that receives a signal and/or an operation call as a Lifeline. Unless it exists in the diagram, the object will be called a 'lifeline object'. 
• record each change in the state of a lifeline object as a StateInvariant on the Lifeline, with the changed state symbol.
• record each change in the feature value of a lifeline object as a StateInvariant on the Lifeline. Changes in value are enclosed in constraint brackets, i.e., {a=10}. 

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You can specify the default values of recordStateChange, recordValueChange, and recordTimestamp through the Project Options dialog. The values in the project options will be used if the tagged values of the sequence diagram generator are not specified. The default values of these project options are true, true, and false (see the following figure). True means all values will be recorded by default.

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