# Doc Entities
## Master Doc Entities Table
| `api/` | Collect API surface instances — operations, semantics, and compatibility guarantees | [api/readme.md](api/readme.md) | 1 |
| `feature/` | Collect navigational hubs — each points to all artifacts for a user-facing capability | [feature/readme.md](feature/readme.md) | 2 |
| `invariant/` | Collect invariants — each states a property, its enforcement, and violation consequences | [invariant/readme.md](invariant/readme.md) | 2 |
## Master Doc Instances Table
| api | 001 | Assign Trait System | [api/001_assign_trait.md](api/001_assign_trait.md) |
| feature | 001 | Component Assignment | [feature/001_component_assignment.md](feature/001_component_assignment.md) |
| feature | 002 | No-Std Support | [feature/002_no_std_support.md](feature/002_no_std_support.md) |
| invariant | 001 | Orphan Rule Constraint | [invariant/001_orphan_rule.md](invariant/001_orphan_rule.md) |
| invariant | 002 | Types Crate Pattern | [invariant/002_types_crate_pattern.md](invariant/002_types_crate_pattern.md) |