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Figure 3-8: Properties window for domain class StartElement
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Figure 3-9: Properties window for the Name domain property
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3: Domain Model Definition
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Up to one domain property in each class may be marked as a name by setting Is Element Name to True as shown in Figure 3-9 Properties with Is Element Name set to True are treated specially in the DSL runtime; for example, their Display Names will be shown in various parts of the runtime user interface, such as the properties window
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The word property can cause confusion, because it has two different meanings In a domain model, a domain class has a set of domain properties, which will govern what exists in the store when the eventual DSL is running In the DSL designer, every element has a set of properties, which are shown in the properties window when the element is selected One source of confusion is the fact that a domain property is just such an element Through the properties window you can see that a domain property, such as the one called Name, has a set of properties, such as Kind Similarly Figure 3-8 showed that every domain class has a Description property, not to be confused with the domain property called Description in Figure 3-7 We ve tried to avoid this confusion by referring explicitly to domain properties wherever possible But you really have to get used to the fact that every domain property has a Name property, and in fact the Name property of the domain property shown in Figure 3-9 has the value Name
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Let s add some domain relationships to our domain model Unlike classes, we don t have to worry about confusing domain relationships with C# relationships, because there is no such thing as a C# relationship! So we usually simply talk about relationships Each relationship has a direction, from left to right The left end is the source and the right end is the target of the relationship There are two kinds of relationships, called embeddings and references Embeddings are represented by shapes connected by solid lines, and references are represented by shapes connected by dashed lines As we ll see, embeddings and references have quite different characteristics, especially in the way that they in uence the way that the language is visualized and serialized We start by looking at reference relationships
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We ll add a Comment domain class to the example and introduce a reference relationship so that a Comment can be associated with any number of StateElements, and a StateElement can have any number of Comments The store at DSL runtime will contain MELs representing StateElements and Comments, connected by links of the new relationship as shown by the dashed lines in Figure 3-10
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Comment CommentText = This is the first state
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Comment CommentText = These are interesting states
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StartElement
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IssueState Name = Raised
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IssueState Name = SubmittedForAssessment IssueState Name = Pending IssueState Name = Closed
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Figure 3-10: Comments linked to IssueStates
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First we add a new domain class called Comment using the Domain Class tool We give it a domain property called CommentText, with the type String Then we select the Reference Relationship tool on the toolbox, click over the Comment domain class, drag to the StateElement domain class, and release This creates a new reference relationship whose name is automatically set to CommentReferencesStateElements We decide that this name doesn t quite represent the intended meaning of the relationship, so we edit it and change it to CommentsReferToIssueStates The result is shown in Figure 3-11 Let s take a close look at the relationship in Figure 3-11 so that we can see its various component parts The relationship itself has a name, CommentsReferToIssueStates, in this case The line at each side of the
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3: Domain Model Definition
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relationship is called a domain role, or often just role Dashed lines indicate reference relationships, as in this case Each role connects the relationship to a domain class, sometimes called the roleplayer for the role
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