What is OCL explain with example?

The Object Constraint Language (OCL) is an expression language that describes constraints on object-oriented languages and other modelling artifacts. OCL is part of Unified Modeling Language (UML) and it plays an important role in the analysis phase of the software lifecycle.

What is OCL notation?

The Object Constraint Language (OCL) started as a complement of the UML notation with the goal to overcome the limitations of UML (and in general, any graphical notation) in terms of precisely specifying detailed aspects of a system design.

What is an OCL invariant?

Object Constraint Language (OCL) Invariant. – Constraint that applies to ALL instances of class (or type or interface) – An expression that evaluates to true if the condition is met. – All Invariants must ALWAYS evaluate to true. Precondition.

What are the two categories of OCL expression?

In OCL, each value has a type. Each expression is evaluated to a result value; the type of the expression is the type of the result value. LoyaltyProgram, Customers, and so on. A user-defined type is a classifier specified in the UML model.

What is class diagram?

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.

Why UML is called unified?

Unified Modeling language (UML) is a standardized modeling language enabling developers to specify, visualize, construct and document artifacts of a software system. Thus, UML makes these artifacts scalable, secure and robust in execution. UML is an important aspect involved in object-oriented software development.

What is OCL in banking?

OCL (Object Constraint Language) is a query and constraint language defined by the OMG (www.omg.org). Example of OCL: The bankCode in the Bank data structure below represents a BIC. It must be 8 or 11 characters long.

What is UML diagram?

What are the 9 UML diagrams?

Class Diagram. Class diagrams are the most common diagrams used in UML.

How many types of UML diagrams are there?

14 different UML diagram
UML provides a large volume of diagramming notation grouped into 14 different UML diagram types, each with different UML models, serving different purposes and addressing different aspects of development needs.

What is the full form of OCL?

OCL Full Form is Online Chess League

What are the types of diagrams in UML 2?

UML 2 has many types of diagrams, which are divided into two categories. Some types represent structural information, and the rest represent general types of behavior, including a few that represent different aspects of interactions. These diagrams can be categorized hierarchically as shown in the following class diagram:

How is OCL used in Model Driven Engineering?

Initially, OCL was only used as a constraint language for UML but quickly ex-panded its scope and now OCL has become a key component of any model-driven engineering (MDE) technique as the default language for expressing all kinds of (meta)model query, manipulation and specification requirements.

Which is the best description of the OCL language?

OCL is a general-purpose (textual) formal language adopted as a standard by the OMG (see the current version of the OCL specification [20]) used to define several kinds of expressions that complement the information of (UML) models. OCL is a typed, declarative and side-effect free specification language.

Who are the members of the UML group?

During the same month the UML Partners formed a group, designed to define the exact meaning of language constructs, chaired by Cris Kobryn and administered by Ed Eykholt, to finalize the specification and integrate it with other standardization efforts.