# Invariant Doc Entity
### Scope
- **Purpose**: Define properties that must always hold throughout all code paths in mod_interface_meta.
- **Responsibility**: Catalog of invariant doc instances governing the namespace layer system.
- **In Scope**: Invariant statements, enforcement mechanisms, and violation consequences.
- **Out of Scope**: Implementation algorithms; those belong in dedicated algorithm doc instances if created.
### Overview Table
| 001 | [Namespace Cascade](001_namespace_cascade.md) | Each layer re-exports all items from lower layers | ✅ |