Because OCL is a modeling language in the first place, not everything in it is promised to be directly executable. Formal Language − OCL is a formal language where all constructs have a formally defined meaning. The specification of OCL is part of the UML specification. OCL is not ...
This notation is shown in the following figure. These notations are used to provide necessary information of a system.RelationshipsA model is not complete unless the relationships between elements are described properly. The Relationship gives a proper meaning to a UML model. Following are the ...
As the strategic value of software increases for many companies, the industry looks for techniques to automate the production of software and to improve quality and reduce cost and time-to-market. These techniques include component technology, visual programming, patterns and frameworks. Businesses also...
The biggest change occurred in the notation of the sequence diagram. Here, among other things, the interaction reference is available as a construct for modularization. However, nothing changed concerning the meaning and functionality of sequence diagrams at the level of detail used in this book. T...
Stereotypes will be used in UML Diagrams.A Stereotype signify a special use and can be applied to almost any element.It modifies the meaning of an element and describes the element's role in the model.Here is a sample Stereotype that defines the element which it is written on is an actor...
or a relation between two categories of workers, or any similar relationship. By default, both elements in an Association are equal, and are aware of each other through the Association. An Association can also be a Navigable Association, meaning that the source end of the association is aware...
a programming language the UML's formal Object Constraint Language (OCL) OCL可以避免歧义,但是也有可能对方不懂OCL而无法理解。 也可以给约束命名: {name : text} 例如: {disallow incest: husband and wife must not be siblings}. 2、Design by Contract ...
The string consists of a name (the tag), a separator (the symbol =), and a value (of the tag) as shown in the Figure below: You can specify just the value if its meaning is unambiguous, such as when the value is the name of the enumeration. Usage of Tagged Values One of the ...
UML as a programming language This goes directly from a UML model to executable code (not just portions of the code as with forward engineering), meaning that every aspect of the system is modeled. Theoretically, you can keep your model indefinitely and use transformations and code generation to...
Crucial to a successful application of model transformations is their correctness, in the sense that the meaning (semantics) of the models is preserved. This is especially important if the models not only describe the structure but also the intended behaviour of the systems. Reasoning about and ...