Developing a DSL Graphical Notation - Eclipse Modeling Project: A Domain-Specific Language Toolkit - page 165

Connections

We must define five Link Mapping elements, with all but the Message Flow
mapping following the pattern given. For Message Flow, only one type exists, so
there is no need to add the child Constraint and Feature Seq Initializer
elements as with the rest. Each link maps to the Connection class in the domain
element, with our usual Containment Feature of the Process
elements:Element reference. A Source Feature and Target Feature are
specified, mapping to the source:Element and target:Element references,
respectively. The appropriate isDirected constraint and initializer are set for
the Association mappings, while the isDefault property is checked or ini-
tialized for the Sequence Flow mappings. Each Link Mapping has an exter-
nal Feature Label Mapping for the name attribute, as seen in Table 4-30.

Table 4-30 Scenario Link Mappings

Element Property Value

Mapping

Link Mapping Containment Feature Process.elements : Element

Element Association -> Connection

Source Feature Connection.source : Element

Target Feature Connection.target : Element

Diagram Link Connection DirectedAssociation

Tool Creation Tool Directed Association

Constraint Body isDirected = true

Feature Seq Initializer Element Class Association -> Connection

Feature Value Spec Body true

Feature Association.isDirected : EBoolean

Data Object

The Data Object mapping is the most basic, with just a Node Mapping for the
DataObject domain element to its corresponding DataObject node and
Creation Tool , along with a Feature Label Mapping for its name:
EString attribute.