Type Inheritance

The VEC uses an object-oriented class and inheritance concept. The following clarifications apply to its use:

• Only non-abstract classes can be instantiated.
• In an inheritance hierarchy, the choice of the used type represents a semantic information itself. For example, the usage of a PluggableTerminalSpecification is a more specific information than the usage of a TerminalSpecification. It is not required to use the more specific class if the information is not available or it should not be transmitted. However, it is not permitted to use the more general class and transfer the information of the more specific class in a custom property, or similar (e.g. use the TerminalSpecification with a CustomProperty type=pluggable).