Domain Relationships in Visual C#

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the right-hand roles, whose property names have been changed to Model, are 11, which is the default multiplicity for the target role of an embedding relationship
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Figure 3-13: Embedding relationships
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TIP Embeddings control nesting in the model explorer
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The best way to think about which relationships should be embeddings is to consider your model explorer If you want elements to be nested in the explorer, make the relationship an embedding; otherwise make it a reference An easy rule of thumb for beginners is to embed every non-root domain class directly in the root domain class and make every other relationship in the domain a reference This is sometimes not ideal, but should always produce a workable DSL
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The root domain class IssueStateModel is not itself the target of any embedding relationship Any Issue State model created at DSL runtime, such as the one depicted in Figure 3-14, will have exactly one root MEL of the class IssueStateModel In the following chapters that describe how to associate a diagrammatic notation and a serialization with this domain model, you ll see that both the diagram and the top-level element of the serialized le correspond to this MEL
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StartElement
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IssueStateModel Name = StateModel IssueState Name = Raised
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IssueState Name = SubmittedForAssessment IssueState Name = Pending IssueState Name = Closed
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Figure 3-14: Root element at DSL runtime
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Multiplicity The multiplicity of a role de nes, given a MEL of a particular class, how many links may have that MEL as roleplayer There are four possible values for multiplicity
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One: Every MEL of this class (or a derived class) must play this role exactly once For example, every Comment must be embedded in an IssueStateModel ZeroOne: A MEL of this class (or a derived class) may play this role no more than once This is equivalent to saying that it may be linked via this relationship with zero or one MEL ZeroMany: A MEL of this class (or a derived class) may play this role any number of times For example, each Comment can refer to any number of StateElements OneMany: Every MEL of this class (or a derived class) must play this role at least once
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References We created a reference relationship earlier References are not constrained like embeddings In general, links from reference relationships can refer from any MEL to any other MEL Indeed, because links are themselves MELs, you can create links between links in order to create complex graphs of objects Bear in mind, however, that a primarily diagrammatic user interface will be used to interact with the graph at DSL runtime, so it is important to keep the design simple enough to understand through such an interface Note, however, that although it is possible to create referencing links between any kinds of MELs or links, embedding links may not target links The next relationship we create is called IssueStateTransition, which goes from IssueState to itself Figure 3-15 shows the detail of this relationship Instances of this relationship are links that represent transitions that connect predecessor states to successor states The multiplicity of both roles is ZeroMany this is the default for reference relationships This relationship has been given a domain property called Action
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Figure 3-15: The IssueStateTransition relationship
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Figure 3-16 shows the on-screen presentation of an example model containing links of this relationship between the four IssueStates called Raised, SubmittedForAssessment, Pending, and Closed In the gure, there are two transitions between the two states Pending and Closed Each transition has a label that speci es the associated action Here is a case in which it is permissible to have more than one link of the same relationship between the same two MELs Because the transitions
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carry actions, this makes perfect sense; the model says that a pending issue can be closed either by solving it or postponing it If the transitions did not carry actions, then having two links between the same two states would not really make sense, so the DSL author would like to be able to prevent this
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