# Architecture principles whose scope is type hierarchy

> 2 records

This index as JSON: https://banes-lab.com/json/api/facets/architecture/scope/type-hierarchy

## Entries

- [Liskov Substitution Principle (LSP)](https://banes-lab.com/records/architecture/liskov-substitution.md): A design rule that a subtype can replace its base type anywhere, because it keeps the base type's preconditions, postconditions and invariants.
- [Visitor Pattern](https://banes-lab.com/records/architecture/visitor-pattern.md): A design pattern that places each operation over a type hierarchy in its own visitor, so an operation is added without editing the element types.