Generalization and inheritance in uml. In diagram given below, we can see that aggregation is represented by an edge with a diamond end pointing towards superclass. Generalization and inheritance in uml

 
In diagram given below, we can see that aggregation is represented by an edge with a diamond end pointing towards superclassGeneralization and inheritance in uml  Inheritance is a key concept in object-oriented programming and plays a significant role in UML Class Diagrams

Specifically, stereotypes describe a new set of modeling constructs as part of the language for specifying you domain. Understandably, there are many different ways of defining and understanding it. Uml diagram inheritance class astah stackInheritance oriented programming administrator 101computing terminology Uml diagram inheritance class diagrams generalization utsa cs edu sourceUml diagram inheritance class dbms. State machine:- It used to describe various states of a single component throughout the software development life cycle. But the lifetime of the B. Inclusion is used to show how a use case breaks into smaller steps. Any Constraints applying to instances of the generalizations also apply to instances of the Classifier. 0, a tagged value can only be represented as an attribute defined on a stereotype. I need help with Explaining the types of relationships between classes modeled in UML (association, dependency, generalization/inheritance, aggregation by value. It is a two-player connection board game, in which the players choose a color and then take turns dropping colored discs into a seven-column, six-row vertically suspended grid. Just you have to make a UML class diagram in a page showing generalization/inheritance, composition, aggregation, association. In BoUML I do not use a stereotype for that but when you edit the generalization you can specify the visibility to use in C++ with an added attribute not part of UML; That means the specificity of the C++. Inheritance is an ultra-strong relationship which means " is (always) a ". Problem: You have a subclass that uses only a portion of the methods of its superclass (or it’s not possible to inherit superclass data). Follow asked Mar 16, 2011 at 14:14. A student is a Person - and a teacher is a Person. Generalisation and Specialisation Generalisation & Inheritance. Generalization in UML. Generalization is different and occurs when you use inheritance. UML Basic Notations - UML is popular for its diagrammatic notations. e. " "In contrast to generalization, specialization means creating new subclasses from an existing class. Classes and UML Class/Object Diagrams. • Generalization: an inheritance relationship • inheritance between classes • interface implementation • Association: a usage relationship • dependencyC++ language. Dependency, sebuah element bergantung dalam beberapa cara ke element lainnya. Generalization relationships are used in class, component, deployment, and use-case diagrams to indicate that the child receives all of the attributes, operations, and relationships that are defined. In particular, UML 2 specifically states that Realization is a Dependency, whereas Generalization (inheritance) is a Taxonomic relation. 2- Both Aggregation and Composition define an 'ownership' relationship - an instance of class A conceptually owns an instance of class B. An aggregation describes a group of objects and how you interact with them. In a UML diagram, this is represented by a dashed line with a triangle on one end. 1. Right click on the Child stereotype and select UML Properties. generalization: A is-a B; When a relationship between two entities isn't one of these, it can just be called "an association" in the generic sense of the term, and further described other ways (note, stereotype, etc). inheritance is a particular kind of association. X is a subclass of Y, written X <: Y, if X is connected to Y by a chain of zero or more generalization arrows. Rules to connect the building blocks. Right click on the Profile Model in Model Explorer and choose Add UML > Stereotype. You need not show attributes or behaviors. • Represents an "is-a" relationship. According to my professor, one of the following relationships cannot be modeled in an object instance diagram: Association. 6 – Generalization • 5 minutes; 1. Inheritance is also called as “generalization”. This sample was created in ConceptDraw DIAGRAM diagramming and vector drawing software using the UML Class Diagram library of the Rapid UML Solution from the Software Development area of ConceptDraw Solution Park. This is different from an association, where an attribute of the former is an instance of the latter. In Unified Modeling Language (UML), delegation is an alternative to inheritance as a way of reusing. 1, p. Final state :- This symbol is used to indicate. When we implement Generalization in a programming language, it is often called Inheritance instead. , only one superclass allowed) The simplified situation is as follows (see also. In UML, a Generalization association between two classes puts them in a hierarchy. You are either one subclass or the other, but never the two at the same time. "Generalization is the process of extracting shared characteristics from two or more classes, and combining them into a generalized superclass. You can say that IParser is realized (implemented) by ParseExits. In a UML diagram, this is represented by a solid line with a triangle on one end. UML is popular for its diagrammatic notations. Use Association arrow when two classes need to communicate and either (or both) class (es) hold reference to the second one. Inheritance. Specifying Delegation is an alternative to inheritance in UML. 1. A Generalization is a is a relationship, and where I can follow if you say. Inheritance is also called generalization and is used to describe the relationship between parent and child classes. Keep it as simple as possible. In a UML diagram, this is represented by a dashed line with a triangle on one end. 4 also provides another definition of navigability: An end property of association that is owned by an end class, or that is a navigable owned end of the association indicates that the association is navigable from the opposite ends; otherwise, the association is not navigable from the opposite ends. A "Tiger" is an "Animal". May I know which is the correct inheritance. The generalization association is unlike any other association, in fact association. Its behavior is defined in terms of provided and required interfaces, [1] is self-contained, and substitutable. Any Constraints applying to instances of the generalizations also apply to instances of the Classifier. A UML class can implement a UML interface. Generalization (inheritance) - a relationship between classes. Example 1: Relatively General Class: Money Relatively Specific Class: Dollar, Euro, Rupees. How to create a UML class diagram in Gleek. The UML Reference Manual [2] (p. On of those things I came up is the differentiation between generalization and classification. In your example, you may say that an Actor is always a Person, and hence, everything you say about a Person is also true for an Actor. A realization is for example a class, which realizes an interface. By Aggregation, this is what I understand: It's a "softer" relation compared to composition. The Unified Modeling Language, or UML, is an industry standard graphical notation for describing and analysing software designs. UML – Class Diagram – Association. We can apply Specialization to a single entity. 1. Generalization: It is also referred as „is-a‟ relationship. The OMG UML specification (UML Superstructure Specification, v2. In this case, you can call it " is a " relationship. Each sub-class inherits the attributes and operations defined. 3. 17. In this case, Class 1 can see all of the public attributes and methods of Class 2. Notice that the Trade hierarchy was completely reversed. Complete the following class diagrams by adding relationships (using UML notations for generalization, inheritance, realization, association, aggregation, composition, dependency, etc. The Unified Modeling Language (UML) class diagrams are used to visually represent classes, their attributes, and inter-relationships between classes. The super class is considered a generalization of the subclass, so it makes sense that the arrow should point to the super class. Unlike UML, ERD, as a language for designing relational mapping, has no direct way of representing a generalization hierarchy. Note: if you have two or more class types with exactly the same set of attributes, you probably have only one class type instead of many!In UML modeling, a generalization relationship is a relationship that implements the concept of object orientation called inheritance. The second rule concerns the ownership of the parts by the whole. You can use the UML Class diagram to evaluate how your local code changes affect the application. Hi Jick, Yes, in fact all UML tools that I have used or tryed (RationalRose, MagicDraw UML, Poseidon for UML, Objecteering, PowerDesigner) draws generalization paths starting from the derived class up to the base class. In UML modeling, a generalization relationship is a relationship in which one model element (the child) is based on another model element (the parent). An object may have a physical existence, like a customer, a car, etc. Class diagrams are static in nature and it represent different kinds of objects exist in the system and the relationship between those objects. To quote from UML Distilled: With classes, dependencies exist for various reasons: One class sends a message to another; one class has another as part of its data; one class mentions another as a parameter to an operation. Generalization and specialization. The most common class relationship is generalization (inheritance), which links generalized classes to their specialized subclasses (Figure 2). It basically describes the inheritance relationship in the world of objects. With this pattern you can be both Manager and Employee at the same time. Diagramming Generalization. Specialization is based on a refinement of types or classes to more specific ones. We can just name this “Class”. 1 Specification] does not. Question: Question 4. In Unified Modeling Language (UML), delegation is an alternative to inheritance as a way of reusing behavior and functionality across classes. The class that owns the reference points to the referred class. After the goal being to generate C++ private (protected) inheritance that means the used tool manages / knows the added stereotype(s). A class consists of its objects, and also it may inherit from other classes. In a UML diagram, this is represented by a solid line with a triangle on one end. Generalization (inheritance) - a relationship between classes. Generalization is associated with inheritance, which is the process of allowing classes to use the properties and methods of already existing classes. Applying Inheritance Using Generalization in UML. Risk multiple inheritance problems, especially in the long run. The extends keyword in Java declares inheritance of both interface and implementation. Generalization relationships are used in class, component, deployment, and use-case diagrams to indicate that the child receives all of the attributes, operations, and relationships that are. You should not have twice the same use-case name to represent different behaviors in the same model. It can also access and update the parent object. You are either one subclass or the other, but never the two at the same time. In UML modeling, a generalization relationship is a relationship in which one model element (the child) is based on another model element (the parent). Inheritance (is-a) relationship Derived2 is-a Base Part Whole Whole has Part as a part; lifetimes might be different; Part might be shared with other Wholes. ( UML 2. The symbols and graphs used in the UML are an outgrowth of efforts in the 1980’s and early 1990’s to devise standards for Computer-Aided Software Engineering (CASE). A Generalization is used to indicate inheritance. Contents 2 •UML Basics - Generalization (Inheritance) – IS-A Relationship - Association - Aggregation - Composition – HAS-A Relationship 3. A full. While inheritance is a popular method of modeling relationships between classes through parent-child relationships, delegation relies on. The Unified Modeling Language (UML) can help you model systems in various ways. UML- Association. In Generalization, size of schema gets reduced. If you're interested in more about UML modeling, I'd recommend purchasing UML Distilled. Generalization is defined as a taxonomic relationship between a more general element and a more specific element. Generalization relationships appear in class, component, and use-case diagrams. With this pattern you can be both Manager and Employee at the same time. Each class object on the diagram often shows the class name, its attributes and operations. EXAMPLES FROM DIAGRAM; SYMBOLS HANDOUT 4. In order for an object model to map with and conform to a data model upon synchronization, inheritance strategy has to be chosen to define the way how entities should be created and structured to represent the. Add method with TAB and add “()” at the end so that Gleek knows it’s a method! 4. A Generalization is a taxonomic relationship between a more general Classifier and a more specific Classifier. Inherited from the UML, Classes, and Objects become Blocks and their instances. Unlike UML, ERD, as a language for designing relational mapping, has no direct way of representing a generalization hierarchy. I have this simple example here: A Player owns exactly 9 Fields, but the distribution of them is irrelevant (i. Associations draw relationships between separate objects. Inheritance uml diagram class java hierarchy. Things can be −. An association almost always implies that one object has the other object as a field/property/attribute (terminology differs). UML does support multiple inheritance, but in most organisations I've worked so far the guidelines forbid the use of multiple inheritance. The transformation transforms this relationship into an inheritance on a C++ class. ) Multiple inheritance Subclass with more than one superclass If attribute (or relationship) originating in the same superclass inherited more than once via different paths in lattice • Included only once in. are the most important building blocks of UML. Generalization, Specialization, and Inheritance. UML Dependency Relationship Generalization relationship. UML Inherited Property. For the example you used you better use the Party-PartyRole pattern. CRC to UML . Another approach could be inheritance between the templates: It corresponds to the C++ semantics. ) NO EXAMPLES IN CLASS DIAGRAM - WILL DISCUSS BELOW C. An abstract class name is shown in italics. UML inheritance is this: “A child class has all attributes and associations that a parent class has, and the child also has attributes and/or associations of its own that the parent does not have. 4. Inheritance is one of the fundamental concepts of Object Oriented programming, in which a class “ gains ” all of the attributes and operations of the class it inherits from, and can override/modify some of them, as well as add more attributes and operations of its own. In the UML, the Inheritance relationship is referred to as a generalization. This doesn't work in the simulation engine though. uml diagramInheritance uml hierarchy 12+ uml diagram. The arrows that connect classes show important relationships. For example the base class "Animal" and the class that inherits from an animal: "Tiger". In UML modeling, a generalization relationship is a relationship in which one model element (the child) is based on another model element (the parent). EXAMPLES FROM DIAGRAM Association and genralization are the most common. In your example, you may say that an Actor is always a Person, and hence, everything you say about a Person is also true for an Actor. 2) Realization: Timer is an interface (not a class as shown) and two realizing classes TimerA and TimerB. 3. In a UML diagram, this is represented by a solid line with a triangle on one end. Select the Generalizations Tab, and click the arrow to "Insert a New Generalization". Generalization. We all know that UML is for visualizing, specifying, constructing and documenting the components of software and non-software systems. JMU Computer Science Course InformationPengertian Use case Diagram. In UML modeling, a generalization relationship is a relationship in which one model element (the child) is based on another model element (the parent). UML Building Blocks - As UML describes the real-time systems, it is very important to make a conceptual model and then proceed gradually. In UML modeling, a generalization relationship is a relationship in which one model element (the child) is based on another model element (the parent). Generalization In UML 1. UML, short for Unified Modeling Language, is a standardized modeling language consisting of an integrated set of diagrams, developed to help system and software developers for specifying, visualizing, constructing, and documenting the artifacts of software systems, as well as for business modeling and other non-software systems. You can also define template binding parameters. In UML 2. The Provided Interface and Required Interface are mostly used for modeling a Component's Interfaces in UML component diagram. A "Tiger" is an "Animal". The included use case is at the arrowhead end. 0, several classes can constitute a generalization set of another class. It is used for classes, packages, usecases, and other elements. 3. create. ” In other words,. It is denoted by a straight line with a hollow arrowhead at one side. The specific element inherits the attributes, relationships, and other characteristics from the general element. While inheritance is a popular method of modeling relationships between classes through parent-child relationships, delegation relies on. Map each class with no generalization and no specialization to a relational table. In extended relationship, Update movie can happen without any use cases. Abstract elements should never depend on concrete ones, so just make two vertical associations unidirectional and point them towards abstract classes. The class diagram is the main building block. An empty arrowhead denotes generalization and inheritance. Because an. 4. Inheritance is usually explained in OOAD and in UML as some mechanism by which more specific classes (called subclasses or derived classes) incorporate structure and behavior of the more general classes (called superclasses, base classes, or parents). Ordinary students automatically have access to library, which visiting students have to explicitly register to obtain. Generalization (inheritance) - a relationship between classes. In the type inheritance, there can be one or more than one sub-class for one super-class. The UML diagram’s Generalisation association is also known as Inheritance. EXAMPLES FROM DIAGRAM; SYMBOLS HANDOUT 4. An aggregation is a special type of association in which objects are assembled or configured together to create a more complex object. The most common way is to show an arrowhead. In software engineering, a class diagram in the Unified Modeling Language (UML) is a type of static structure diagram that describes the structure of a system by showing the system's classes, their attributes, operations (or methods), and the relationships among objects. 3 Association. By the way, the UML specification do not defined what exactly is meant when multiple actors are related to the same use-case: it can be multiple actors each involved separately in. UML is standardized in class diagrams. EXAMPLES FROM DIAGRAM Association and genralization are the most common. 6. Association B. Thus the diagram applies to all the objects in the system. 25 Dependency 55 4. 26: Figure 4. The correct name of relationship is Generalization. Each instance of the specific Classifier is also an instance of the general Classifier. Realization - a relationship between a class and an interface. Brewer CS 169 Lecture 5 22 Sequence Diagrams. In OOAD inheritance is usually defined as a mechanism by which more specific classes (called subclasses or derived classes) incorporate structure and behavior of more general classes (called superclasses or base classes). 11 – Generalization with Interfaces in Java and UML • 8 minutesUses for UML as a sketch: to communicate aspects of system forward design: doing UML before coding backward design: doing UML after coding as documentation often done on whiteboard or paper used h l i idd to get rough selective ideas as a blueprint: a complete design to be implemented sometimes done with CASE (Computer-Aided Software. Two derived classes TimerA and TimerB with generalization link inheriting the operations of class Timer. Inheritance for use cases means changing some behaviour, not exzactly specifying where. In C++, Generalization is public inheritance; Problems with Generalization. It supports the specification, analysis, design, verification and validation of a broad range of systems and systems-of-systems . 1. Generalization is the process of extracting shared characteristics from two or more classes, and combining them into a generalized superclass. Unfortunately, once an object created as Admin, it will always stay an Admin. (The latter can be a bit ambiguous however, as we might also say that Webster’s Dictionary “is a” Book, but that’s not a generalization. The existing class is the superclass while the new class is the subclass. Hence, visualization is the most important part which needs to be understood and remembered. In such case you can attach the information via associations, or by reversing the hierarchy. By default, implementation of inheritance in OO languages is disjoint. UML Class Diagram Introduction 簡介 UML:Unified Modeling Language 統一塑模語言 描述了系統的類別集合,類別的屬性和類別之間的關係 Class Diagram 類別圖 Stereotyp. 4, this capability, although still supported, was deprecated, to be used only for backward compatibility reasons. For modeling classes that illustrate technical concepts they. You could perfectly imagine to have a User that has an Admin role, without Admin inheriting from User. 12+ uml diagram for inheritance. NET, I will explain the concepts of inheritance, abstraction, and polymorphism. Association arrow usage. Generalisation is the term that we use to denote abstraction of common properties into a base class in UML. The purpose of this article is to explain a series of. Specifying Delegation is an alternative to inheritance in UML. Everything we will discuss in this series of lectures is summarized in a handout. Question: Part II: requirements modeling 1. Inheritance and inheritance hierarchies are more challenging to get. The Field class is abstract. Generalization. UML – Class Diagram – Generalization & Realization. Class diagrams are static in nature and it represent different kinds of objects exist in the system and the relationship between those objects. Inheritance is used to form a "is-a" relationship. The transformation applies the public keyword to the inheritance if the «cpp_generalization» stereotype is applied to the realization relationship, and if the GeneralizationKind property has a value of public. 2. 5 Endfields, 4 Startfields or 1 Endfield and 8 Startfields). In this case I even did away with the association-class in favor of a regular class with regular. Literally, the child classes “inherit” the common functionality defined in the. 1 Modeling Simple Dependencies. This is just the natural way to draw generalization paths in UML. Generalization vs Inheritance. Shared characteristics can be attributes, associations, or methods. Further, for “Account” class, “User” is a superclass. It implies a more refined or. UML class diagram relationships can be visualized using different types of arrows and symbols, depending on the type of relationship. UML (Unified Modeling Language) class diagrams are a type of diagram that provide a graphical representation of the classes, interfaces, and objects in an object oriented system. A class describes a set of objects that shares the same specifications of features, constraints, and semantics. Sorted by: 10. Uses for UML • as a sketch: to communicate aspects of system – forward design: doing UML before coding – backward design: doing UML after coding as documentation – often done on whiteboard or paper – used to get rough selective ideas • as a blueprint: a complete design to be implemented – sometimes done with CASE (Computer-Aided. By Generalization, I can understand that it's a " is a" -relationship. 2. 4. It is about Level of Detail & Scope, The. In Chapter 5 - Class Diagrams: Advanced Concepts, Martin Fowler wrote at the end of the section. " Generally, you can think of a classifier as a class, but technically a classifier is a more general term that refers to the other three types above as well. A Class in UML diagram is a blueprint used to create an object or set of objects. Let’s take a look at these. Otherwise, we say the inheritance set is overlapping. Abstract elements should never depend on concrete ones, so just make two vertical associations unidirectional and point them towards abstract classes. Generalization Hierarchies and Lattices (cont’d. 4. Details. This sample was created in ConceptDraw PRO diagramming and vector drawing software using the UML Class Diagram library of the Rapid UML Solution from the Software. Class diagrams depict a static view of the model, or part of the model, describing what attributes and behavior it has rather than detailing the methods for achieving operations. When we implement Generalization in a programming language, it is called Inheritance . In UML modeling, a generalization relationship is a relationship that implements the concept of object orientation called inheritance. Inheritance is drawn as an empty arrow, pointing from the subclass to the superclass. 3. 3 tagged values could extend a model element without requiring the presence of a stereotype. Also defined as deriving new classes ( sub classes) from existing ones such as super class or base class and then forming them into a. Press Alt + D or Option + D to get a preview of the generated diagram. Association classes make your model harder to understand for the less UML savvy. UML 2. Words such as "kind of" or "type of" are often used to describe the generalization association. You can double-click a node to view changes in. " [1]3 Answers. Include between two use cases. UML inheritance is the same as OO-inheritance (Object oriented inheritance). 2. UML vs. UML guides the creation of multiple types of diagrams such as interaction , structure and behaviour diagrams. Oak Tree, Maple Tree, Shrub, Branch, Lawn, Leaf, Grass. It describes what an element is. Inheritance in UML Class Diagram. In UML 2. From the context menu of the code editor, the Project tool window, or the Changes view, select Show Local Changes as UML, or press Command Alt Shift D. Different Inheritance Strategies. Generalization maps or groups types or classes to more abstract or combined ones. Option 2 - inheritance. To comply with UML semantics, the model elements in a generalization relationship must be the. The subclass is preferably put below the superclass to express the hierarchy as in the example to the right where Company and Person are subclasses of the superclass Customer. UML diagrams are the ultimate output of the entire discussion. Replace Inheritance with Delegation. Create a generalization from a third use case C to the super use case. Does inheritance in UML indicate just inheriting the attributes/operations, or also the links/associations? uml; Share. Generalization relationships are denoted in UML by using a solid line with a triangle on the base class end. fUML excludes redefinition of ActivityNodes, so this could be an explanation why Activity generalization doesn't work. Several clients can realize the behavior of a single supplier. 2 and earlier, is a generalization relationship where an extending use case continues the behavior of a base use case. 00:10 What are the most important relationships in a UML class diagram? 00:20 What are the different types of association relationships? 00:45 What is a depe. Class diagram: generalization (inheritance) The generalization relationship notated in UML by a solid line with an enclosed hollow arrow , pointing back to the general (base) class. In UML, a Generalization association between two classes puts them in a hierarchy. A UML class diagram implementing multiple inheritance. I have read this post: Use case generalization versus extension. Two derived classes TimerA and TimerB with generalization link inheriting the operations of class Timer. The class diagram depicts a static view of an application. The UML representation of a class is a rectangle containing three compartments stacked vertically, as shown in Figure 1. m = 10 kg, c = 50 N-s/m, k = 1000 N/m b. The following explanations might help clarify the " extend " and " include " relationships on use case diagrams: Include: An including use case calls or invokes the included one. Create two such stereotypes, one will be the parent, the other will be the child. 4. A class can be the specialization of several more generalization class but always in the same time (i. Create your first class. Composition. In addition, I would further refine your model: The association between Document and FieldValue should be a conposition. Find the energy lost by a viscously damped single-degree-of-freedom system with the following parameters during a cycle of simple harmonic motion given by x (t) = 0. They are used to model the. In a UML diagram, this is represented by a solid line with a triangle on one end. It is relationship between a class (super class) and one or more variations of the class (sub classes). Class diagrams are most useful in illustrating relationships between classes and interfaces. Explanation: Inheritance is not a relationship type in UML, it is a mechanism for code reuse in object-oriented programming. It describes what an element is. A generalization between the associations would imply the unnamed end of type T is a subset of values for the unnamed end of type S. Ada beberapa relasi yang terdapat pada use case diagram: 1. A full. instances of a supertype only appear at most in a subclass). In UML inheritance is depicted as generalization relationship. Since it connects the object of one class to the object of another class, it is categorized as a structural relationship. In UML models, an aggregation relationship shows a classifier as a part of or subordinate to another classifier. is “a diagram that shows the relationships among actors and use cases within a system. Something of the difference can be illustrated by the following simple class diagram: 64. opportunity for using inheritance (compare the class diagram of our case study). Note that multiple inheritance is allowed in UML, even though this feature isn't supported in some object-oriented languages (like Java):. Multiplicity in UML allows to specify cardinality - i. By the way, you should avoid repeating inherited properties or methods, since it could create some ambiguity. In our online grocery store example, we might have three superclasses, “Employee”, “Company”, and “Parent Company”. Since UML 2. Will need to derive an XML-compliant UML model from it (a. As UML describes the real-time systems, it is very important to make a conceptual model and then proceed gradually. We can just name this “Class”. Generalization relationships appear in class, component, and use-case diagrams. 4- You may want to reconsider the level of granularity of your use cases as well; turn on with IR/Knob and turn off with IR/Knob may all be. Specialization Class Diagrams. EXAMPLES FROM DIAGRAM 4. 1. Generalization relationships appear in class, component, and use-case diagrams. 2. Inherited from the UML, Classes, and Objects become Blocks and their instances. How to create a UML class diagram in Gleek. 2. Each class plays a specific role in the relationship, where the role names depend on the context. UML represents a unification of these efforts. You need a Usage dependency from A to B in addition to your Generalization. Aggregation relationship is represented by a straight line with an empty diamond at one end. It exists between two objects (things or entities), such that one entity is a parent (superclass or base class), and the other one is a child (subclass or derived class). – Some parts of UML underspecified, inconsistent x i tofsna–Pl Prof. Getter Methods are to retrieve data. In a UML diagram, this is represented by a dashed line with a triangle on one end. I have read this post: Use case generalization versus extension. Inheritance (or Generalization): Represents an "is-a" relationship. The term association is used to refer a specific types of logical connections found on class.