Cross-Referencing in C#.NET

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Relationship Derivation Relationship derivation allows a link of a derived relationship to be considered as if it were a link of its base relationship The effect of relationship derivation on serialization is quite straightforward The basic rule is that it is necessary for the saved le to provide enough information to know which relationship a link instantiates In the current example, the relationship Transition is abstract If it had been concrete, then the XML corresponding to Figure 6-1 would have been ambiguous, because it isn t possible to tell whether the <issueStateMoniker> element within the <successors> element for an IssueState corresponds to a link of the Transition relationship or the IssueStateTransition relationship In such circumstances, it would be necessary to serialize the links in full form Again, the DSL designer will validate your model to ensure that this is done correctly
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Cross-Referencing
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Because a model is in general a graph, rather than a tree, it is necessary to represent cross-references, such as the transitions between IssueStates in our example, in the saved XML form Cross-references can also be used when elements in one le refer to elements in another, for example, the references between a diagram and its associated model The technique used in the DSL Tools to represent unresolved references in the In-Memory Store is called monikers A Moniker is an object in the store that holds a string that can be used to identify the MEL that is the actual target of the relationship A Moniker object can act as a roleplayer in a link, in which case it is a placeholder for the element that will eventually be the roleplayer When the store contains the target MEL, the Moniker can be resolved, at which point the placeholder Moniker will be substituted by the actual target MEL to complete the graph Consider, for example, loading a le that contains forward references such as the element
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<issueStateMoniker name="StateModel/Submitted" />
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6: Serialization
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in the XML le presented earlier When this reference is encountered, a link of the relationship IssueStateTransition is created, with the NextState role played by a Moniker object holding the string StateModel/Submitted After the complete le has been read, all of the monikers are resolved, and this one will be replaced in the link by the IssueState MEL with the name Submitted, thus completing the graph There are many possible schemes for creating references to elements The scheme described in this chapter is implemented by the DSL Tools through a class called SimpleMonikerResolver This built-in scheme can be overridden for advanced scenarios if required but is actually quite sophisticated as it stands The remainder of this section describes this scheme As already observed, any MEL that may be the target of a reference must be uniquely identi able We say that such an element must have a key There are two kinds of keys: a Guid and a quali ed name
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Using Guids as References We saw in the example earlier that the Comment object is serialized with a Guid:
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<comment Id="9f8bc7e9-579c-402a-a9a3-c854767161d1"> <commentText>This is the first state</commentText> <subjects> <issueStateMoniker name="/CJKWStates/StateModel/Raised" /> </subjects> </comment>
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We sometimes call such an element de nitional, to distinguish it from a reference element An element representing a reference to this looks like:
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<commentMoniker Id="9f8bc7e9-579c-402a-a9a3-c854767161d1" />
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By default, the element names for reference elements have the string Moniker appended to the element name of the de nitional element, as in this case These element names are customizable and can be any legal unique XML element name In order for an Id to be serialized for a MEL, its domain class must be marked with the metadata element Serialize Id = True This property can be found under the Xml Serialization Behavior section of the DSL explorer, as shown in Figure 6-3
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