Abstract
Design and programming are important stages of the development process of object-oriented information systems. At the design stage, a domain model is built, in which metaclasses can be used. But, as widely known, there is no direct support for metaclasses in UML. The article describes how in some cases it is possible to switch from models with metaclasses to models with regular classes. Several variants of such a transition are given. Two concepts of the metaclass are considered, which have now found application. Examples are given showing what capabilities the Python, Scala and Objective-C programming languages have for implementing such models. In addition, it analyzes how the concept of a metaclass is interpreted differently in programming languages.
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