uml modeling tools

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Document directory The UML use case diagram contains three relationships: (include), (extend), and (generalization ). Overview The Use Case attempts to summarize the relationship between roles and systems in the use case, and describes the functional requirements of the system, the interaction between roles and systems, and the system response. Official definition: Use Cases define a set of use cases, each of which is a series of operations perfo

be solved, and solve these small problems. In addition, modeling can enhance human intelligence, and an appropriately selected model can enable modelers to work at a higher level of abstraction.3. Modeling principles;(1), choose what model to create, have a profound impact on how to solve the problem and how to form a solution(2), each model can be represented at different levels of accuracyIn any case, th

(i) UML Overview1, object-oriented software development process:(1) OOA (object-oriented analysis): Establish an analytical model and document it. (2) OOD (object oriented design): The result of OOA is refined by object-oriented thought, and the design model is obtained. (3) OOP (object-oriented programming)2, UML is the results of OOA and ood with a unified symbol to describe and record. 3,

or describe other features such as composite aggregation, navigation, judgment, association classes, and special categories of dependency and generalization relationships. These and many other features can be expressed in UML, but they belong to a deeper concept.Dependencies, generalizations, and associations is all static things defined at the level of classes. In the UML, these relationships is usually v

customer failure to understand use cases11) In some cases, it is not appropriate to use use case diagrams to describe requirements SummaryIn the requirements analysis phase of software engineering, it is often necessary to model the target system using the UML use case diagram, and through the visual use case models, theThe system to be developed has a visible description that enables developers and users to reach a consensus on requirements specif

Today I borrowed a concise tutorial on the Standard Object Modeling Language (UML Distilled: a brief guide to the standard Object Modeling Language ). Translated by Mr. Xu Jiafu. In general, I feel that a good book is ruined. Those in the beginning of this article are not in the same order. For example, "If someone accidentally falls into my trap and the Controll

Case modeling is a part of UML modeling and the most basic part of UML. The main function of case modeling is to express the functional requirements or behaviors of the system. To put it bluntly, it is to explain what the system is, so you don't have to worry about how to wo

use-case descriptions, I think we have to use the hands-on approach anyway. We will use the example of the loan request in my first column, and you will see how the use case becomes more complex as the size increases. In particular, we want to pay attention to the role of perspective in use case modeling. As we drill down, you'll see how the perspective is used to work for you, or how it hinders you from working if it is applied incorrectly. What is

Case modeling is a part of UML modeling and the most basic part of UML. The main function of case modeling is to express the functional requirements or behaviors of the system. The participants of use cases are not specific to users, but also those outside the system that p

Overview The data model profile is a UML extension of Enterprise impact ect to support relational database modeling. It includes some custom extensions, such as tables, database charts, table keys, triggers and constraints. It is a technology used to model relational databases in UML. Data Modeling not only support

quotation marks (the French citation is "") and placed above the name of another component. Optionally the stereotyped element is rendered by using a new icon associated with that stereotype.Arbitrarily modeled elements can be represented by using a new icon that is linked to that stereotype.A Tagged value is a property of a stereotype, allowing the create new information in an element bearing that stereotype. Graphically, a tagged value is rendered as a string of the form name=value within a

Author: gnuhpcSource: http://www.cnblogs.com/gnuhpc/ 1. UML is a tool launched by Object Management Group to simplify complex software engineering processes. with UML, you can customize and Visualize Software and non-software design. Note that UML is only a modeling language. It only defines words and grammar, but does

subsystems. VI,Example In the book management system, the staff can maintain (add, delete, and update) reader information, and maintain book information. Readers can request to borrow, return, and renew books through the Book Administrator, readers can log on to and query books and borrowing information. The example graph is provided. References: [1] Tang xuezhong and others . UML Object-Oriented Analysis and

UML is generally used in case-driven, architecture-centric, iterative, and incremental development. UML uses the following five views to describe the architecture of the software system: User Model View-use case diagram to describe system functions from the outside Structure Model View-class charts and object graphs, describing classes, objects, relationships between them, and other static structures

1. Why to use UML modeling What is the model? The model is the abstract simulation and simplification of the shape or state of the real world, which provides the skeleton and blueprint of the system. Models help visualize the system in terms of the actual situation or the desired style. The model can regulate the structure or behavior of the system. The model provides a template to guide the constructio

nested state machine is remembered; The deep history pseudo State will remember the deepest nested state in any depth, expressed. Next, let's look at a completed status chart. Let's take a look at the effects drawn from visio: It is more intuitive and easier to understand. Summary) The state chart focuses on describing the state of the object and the transfer between States. The basic elements of the state chart mainly include: status, transfer, action, self-transf

, the aggregate object is responsible for the life cycle of some objects.7. the connotation of the extend relationship between use cases in use case diagrams:The extended relationship between use cases is used to model the user as part of a use case that is considered an optional system behavior. In this way, the optional behavior can be separated from the required behavior.8. Generalization relationships describe the ability of a participant to complete another participant's and can supplement

variable name and its class type in the box in the horizontal axis direction, as shown in Figure 2. This form does not include loops, conditions, and branches that are common in conventional forms. In the actual control process in the system, some assertions made during the interaction may be false. If the assertion is found to be false, all messages in the instance sequence diagram are empty, and this situation will not occur. An instance sequence diagram describes a single situation that may

determined by common sense and other factors; it is generally used to define static and natural structures between objects; Therefore, the association relation is a kind of "strong association" relationship;For example, between the passenger and the ticket is an association relationship; students and schools are an association;The association relationship by default does not emphasize direction, which means that objects know each other, and if the direction is particularly stressed, for example