Cross-Referencing in C#

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Figure 6-3: Setting Serialize Id
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The result of this is that the Id used to identify the MEL in the store is automatically written out into the Id attribute of the corresponding XML element The DSL designer will automatically set Serialize Id when it is needed, that is, when an element is the target of a reference and does not have any other kind of key
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TIP The DSL designer checks whether keys are properly defined
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The user does not normally need to be concerned about whether domain classes de ne keys or not the tool will ensure that there are keys, if necessary If users override the options so that necessary keys are absent, they ll be warned through validation errors
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6: Serialization
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Using Qualified Names as References Quali ed names are names of the form "/CJKWStates/StateModel/Raised" They consist of a sequence of strings separated by the / character They occur in references either in full form or in short form Quali ed names are used when the DSL author speci es that a particular domain property usually a name domain property is to be used as a key A full-form quali ed name for an object is constructed from the key property of the referenced object ("Raised"in the example), prepended by the values of key properties for its embedding ancestors ("StateModel" in the example) A full-form quali ed name always starts with / If keys were the only thing used to construct quali ed names, every quali ed name would start out with the key of the root element of the model, walking down the whole model to the referenced element, and this can be cumbersome for deeply nested models To enable quali ed names to be expressed more ef ciently, the concept of a quali er is introduced A quali er is much like a key but it has the special property of always starting the quali ed name In a particular domain model, certain domain classes are important containers that can have many embedded children The DSL author identi es a property of that class that will be unique for every instance and de nes that property to be a quali er Then the quali er property of the container MEL will form the rst segment of the fully quali ed name for any of the embedded descendents of that MEL The NamespaceName property of the IssueStateModel has been marked to be a quali er, so the fully quali ed name of all of the IssueState MELs has this value as the rst segment of the name Subsequent segments of the name are the key values found in the embedding hierarchy between the MEL that contains a quali er and the MEL being referenced In the example, the domain property IssueTypeName of the IssueStateModel domain class has been marked as a key, which produces the second segment of the fully quali ed name A particular bene t of quali ers is that they can be omitted whenever the quali er value for the referring element and the referred-to element are the same This produces the short form of the quali ed name, which we see in the example Notice that the short form of the name does not start with / :
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<issueStateMoniker name="StateModel/Submitted" />
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For quali ed names to work correctly, they clearly have to be unique This happens as long as the key value for each element is unique within the scope of its nearest embedding ancestor that also has a key or quali er In general, it is up to the DSL author to ensure that this is the case; if a DSL author fails to do so, and a model ends up with non-unique keys, then it will fail to save However, we saw in 3 that marking a property as a name ensures that it gets a unique value within the context of the MEL s parent when it is rst created This is such a useful pattern for keys that the Named Domain Class element on the toolbox, introduced in 3, automatically speci es that the name property is a key
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References to Links It is relatively unusual for a DSL author to create models containing references to relationships that, when instantiated, will cause links between links When this is done, the relationship at the target end of the reference must have either an Id or a key; the only difference between this situation and the normal con guration of links between MELs is that the container within which keys must be unique is the MEL at the source of the link rather than the embedding MEL However, it is extremely common to have links that associate connectors on diagrams with links in models Using the basic scheme outlined so far, this would result in every link referred to by a connector having to carry a key value Notice, though, that unless the link is marked with Allows Duplicates set, the identity of a link can be uniquely determined from its type and the identities of the MELs at its ends Exploiting this, the diagram serialization scheme uses special case code to identify links associated with connectors and the links do not need to carry their own explicit key When Allows Duplicates is set, on the other hand, it is necessary for links associated with diagram connectors to carry a key The model illustrated in Figure 6-4 is built from a domain model that has Allows Duplicates set on the relationship IssueStateTransition, as demonstrated by the existence of two links between the Submitted and Pending states
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