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Figure 3-11: The CommentsReferToIssueStates domain relationship
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A name is shown next to each role This is called its property name Default property names are calculated by the DSL designer from the names of the roleplayer classes The property name StateElements on the lefthand role is not very descriptive, so we edit it and change it to Subjects, resulting in Figure 3-12
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Figure 3-12: Property names and multiplicities on roles
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Domain Relationships
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Figure 3-12 also shows that each role has a multiplicity In this case, the source role s roleplayer is Comment, its property name is Subjects, and its multiplicity is ZeroMany, which shows up on the diagram as 0*; the target role s roleplayer is StateElement, its property name is Comments, and its multiplicity is again ZeroMany In addition to its property name, a role has a name, which is not shown on the design surface We ll see later how the name of a role is used when code is generated for the relationship We ve already seen that default values for the names of roles and relationships are created by the DSL designer The default name of a role is set to be the same as the name of its roleplayer domain class The property name of a role defaults to be the same as the name of its opposite role, pluralized in cases where the multiplicity is Many The name of an embedding relationship defaults to be XHasY, where X is the name of the source role player, and Y is the property name of the source role The name of a reference relationship defaults to be XReferencesY, where X and Y are calculated in the same way This scheme usually gives a reasonably meaningful set of names for relationships and roles, and avoids a good deal of unnecessary work on the part of the DSL author All of the names can be explicitly overridden by the author if desired, and we ve given a couple of examples of doing that Selecting Reset on the context menu for the property s entry in the properties window will reset it to the default
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Embeddings Some relationships are embeddings, which are displayed using solid lines Embeddings provide a way to navigate through your model as a tree, that is, as a structure in which every element (except for the single element at the root of the tree) has exactly one parent element This is important for several reasons The rst is that models are typically serialized as XML les, and the structure of an XML document is intrinsically a tree of elements, starting at the root element The embedding de ned in the domain model determines the structure of this tree of XML elements 6 returns to this topic in much more detail Second, recall from 2 that the generated designer for your DSL has a model explorer The embedding structure determines the organization of this explorer, because an explorer is also structured as a tree
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3: Domain Model Definition
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Third, the embedding structure also provides a default for how deletion and copying behavior is propagated through a model By default, the deletion of an embedding parent deletes its children, while the deletion of a roleplayer MEL in a reference link deletes the link but not the other end Marking a relationship as an embedding places some special constraints on it, as follows: 1 The multiplicity on the target role must be either One or ZeroOne, because a MEL can only be embedded once 2 If a domain class is a target in more than one embedding relationship, the multiplicity of all of those target roles must be ZeroOne, because a MEL of the class can only be embedded by one of those relationships at a time Marking any one of the roles as One would make all of the other relationships impossible to instantiate 3 In a complete domain model, every domain class except the root must be the target of at least one embedding relationship, because it would not be possible to create trees of MELs otherwise, and so the model explorer and serialization would not work Let s create some embedding relationships Taking the domain model created so far and selecting the context menu item Validate All produces the warning DomainClass IssueState is not abstract, and is neither a root of the model nor embedded within it and similar warnings for StartElement and Comment These warnings appear because it is not possible to create trees of MELs with the domain model created so far Therefore, it would not be possible for the Issue State designer to display a model explorer or to save the models as les To enable the models to be trees, we must create two embedding relationships, one that embeds Comments into the IssueStateModel, and one that embeds StateElements into the IssueStateModel These relationships are created using the Embedding Relationship tool, using the same gestures as the Reference Relationship tool The resulting relationships are shown in Figure 3-13 Notice that the multiplicity on
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