Object Constraint Language (OCL)

Object Constraint Language (OCL) is a formal language used in software design to specify rules and conditions for object-oriented systems. It allows developers to define constraints on data and behavior to ensure that software behaves as intended. For instance, OCL can express that a person's age must always be a positive number or that a project must have at least one task. By using OCL, developers can improve the clarity of their designs and prevent errors, facilitating better communication about system requirements and helping ensure consistency throughout the development process.