Generalization in .NET

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Generalization
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Consists of sets of entities with LOOSE associations that comprise a higher level entity Entity B Entity B1 Entity B3 Entity B2 Entity B4
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UML Symbology
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Aggregation (Composition) Indicator
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= Strong Association
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System A System A
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UML Symbology
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Entity B Entity B Generalization Indicator
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Entity Entity A1 A1
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Entity Entity A2 A2
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Entity Entity A3 A3
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Entity Entity A4 A4
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Entity Entity B1 B1
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Entity Entity B2 B2
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Entity Entity B3 B3
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Entity Entity B4 B4
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Figure 2.3 Hierarchical Aggregation and Generalization Symbology
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2.4 Graphical Conventions
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Relationship Dependencies
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In general, this text employs three types of line conventions to express entity/object relationship dependencies as illustrated in Figure 2.4. Instances of a Relationship That May or May Not Exist (Panel A) Since there are instances that may or may not contain a speci c relationship, a dashed line is used for all or a part of the line. Where an aggregated entity/object may or may not have all instances of siblings, the parent half of the line is solid and the sibling half may be dashed. Electronic/Mechanical Relationships (Panel B) Some graphics express electronic relationships by solid lines and mechanical relationships by dashed lines. For example, a computer s electronic data communications interface with another computer is illustrated by a solid line. The mechanical relationship between a disc and a computer is illustrated by a dashed line to infer either a mechanical or a temporary connection. Logical/Physical Entity Relationships (Panels C and D) Since entities/objects have logical associations or indirect relationships, we employ a dashed line to indicate the relationship.
Interaction Diagrams
UML accommodates interactions between entities such as people, objects, roles, and so forth, which are referred to as actors via interaction or sequence diagrams, as illustrated in Figure 2.5. Each actor (object class) consists of a vertical time-based line referred to as a lifeline. Each actor s lifeline consists of activation boxes that represent time-based processing. When interactions occur between actors, an event stimulates the activation box of the interfacing actor. As a result, a simple sequence of actions will represent interchanges between actors.
A Relationship Instances that May or May Not Exist
Entity A All Instances of A1 Exist (Solid Line) Specific Instances of A2 May or May Not Exist (Dashed Line) Entity A
B Electrical/Mechanical Relationships
Entity B
Entity C Entity A1 Entity A2 Where: = Data Flow (Solid Line) = Mechanical Interfaces (Dashed)
Logical Associations or Relationships
Entity A Entity B
Direct Physical Associations or Relationships
Entity A Entity B
Logical Relationship or Association (Dashed Line)
Physical Relationship or Association (Solid Line)
Figure 2.4 Dashed Line Conventions
2
Book Organization and Conventions
Entity B
Actor A
(Class)
Actor B1
(Class)
Actor B2
(Class)
Sequence (Author s Convention)
Lifelines
Activation Box
Events
Figure 2.5 UML Sequence Diagram Symbology
Process Activity Graphics
Systems processing consists of sequential and concurrent process ows and combinations of the two. Key UML elements for representing process ow consist of initial/ nal states, activities, decision blocks, and synchronization bars (forks and joins), as illustrated in Figure 2.6. Initial and Final States. To isolate on speci c aspects of process ow, a process requires a beginning referred to as an INITIAL STATE and an ending we refer to as a FINAL STATE. UML symbolizes the INITIAL STATE with a lled (black) circle and the FINAL STATE with a large un lled (white) circle encompassing a lled (black) circle. Activities. Activities consist of operations or tasks that transform and add value to one or mode inputs to produce an objective-based outcome within a given set of performance constraints such as resources, controls, and time. UML graphically symbolizes activities as having a at top and bottom with convex arcs on the left and right sides. Decision Blocks. Process ows inevitably have staging or control points that require a decision to be made. Therefore, UML uses a diamond shape to symbolize decisions that conditionally branch the process ow to other processing activities. Synchronization Bars. Some entity processing requires concurrent activities that require synchronization. For these cases, synchronization bars are used and consist of two types: forks and joins. Forks provide a means to branch condition-based processing ow to speci c activities. Joins synchronize and integrate multiple branches into a single process ow.
Hierarchical Decomposition Notation Conventions
Systems are composed of parent sibling hierarchies of entities or objects. Each object or entity within the diagram s structural framework requires establishing a numbering convention to uniquely