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One last improvement can be made to this model We have chosen the multiplicities on each role to t the situations depicted in the example snapshots But there is also another restriction From the snapshot, you can see that an IssueCategory can belong to a Project or it can be a subcategory of another IssueCategory Trying out variations on this snapshot would soon reveal that it cannot both belong to a project and be a subcategory, and would also raise the question of whether it could belong to two projects or be subcategories of different categories Assuming that none of these situations is allowed, we
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conclude that an IssueCategory should only have one parent whether it is another IssueCategory or a Project To represent this information, we can create a class that abstracts the IssueCategory-parenting characteristics of Project and IssueCategory, as shown in Figure 11-7
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Figure 11-7: Domain model CategoryParent
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The relationship CategoryParentHasCategories from CategoryParent to IssueCategory has a multiplicity of 1 at the parent end By forcing the other two relationships of IssueCategory (to parent Project and parent
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IssueCategory) to be subrelationships of CategoryParentHasCategories, we force there to be only one element at a time playing the parent role in a relationship Thus, each IssueCategory must either be embedded under a Project or under another IssueCategory, but not both
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Now we turn to the Issue State part of the domain, shown in Figure 11-8 We ve added an extra IssueStateModel root domain class in which the projects are embedded Top level states are then embedded in projects, and other states embedded beneath them The chain of states headed by the project seemed natural enough to the CJKW developers when they drew it on the whiteboard at rst, but more experienced modelers may nd it slightly odd We ll see how this initial domain model is evolved as the notation is explored
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Project bug Initial state IssueState Unassigned IssueState Rejected Allowed state transitions
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IssueState Assigned IssueState Completed
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Figure 11-8: Issue State domain model
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We have a domain model, which just de nes the concepts that the language deals in; now we want to decide how it looks on the screen and what you can
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do with it in the designer Given that notations in the DSL Tools are currently mostly restricted to nodes and lines, we might at rst think that, looking at the snapshots we have drawn, we need only decide the shapes of the nodes However, that isn t quite true there are some decisions still to be made It s worth reiterating that no development process is linear It is at this point that we converge with those who have known all along what their notation is going to look like, as we discussed in an earlier section In fact, we generally move quite rapidly between trying out concrete notations, investigating the underlying domain model, and sketching snapshots of the surrounding context Working with the domain model and snapshots helps ensure we are including everything we need the DSL to say; experimenting with concrete notation helps understand how we want to say it There are four ways to represent a relationship in concrete syntax: 1 Connector Each link of the relationship maps to a connector on the diagram, with the related elements represented as shapes This is how we have drawn all the relationships in the snapshots; it works for any relationship 2 Nesting A shape nesting inside a swimlane or other shape can represent a one-one or one-many relationship For example, subcategories can be shown as shapes inside their parent categories 3 Compartments An item in a compartment list shows a chosen property of the other end of a one-many relationship The disadvantages are that it only shows one line of information about the target and can t nest deeper than one level The bene t is that it is very compact compared to having a complete shape per element 4 Explorer only The relationship is not shown on the diagram and just appears in the language explorer
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