flowchart TB District["District — the Tenant
hard isolation boundary"]:::l1 School["School"]:::l2 Course["Course"]:::l3 Section["Section
a class period / cohort"]:::l4 Enrollment{"Enrollment
Student ↔ Section"}:::rel Student["Student
pseudonymous"]:::l5 District -->|HAS_SCHOOL| School School -->|OFFERS| Course Course -->|HAS_SECTION| Section Section -->|ENROLLED_IN| Enrollment Enrollment -->|ENROLLED_IN| Student classDef l1 fill:#0f5c53,stroke:#0a3f39,color:#fff,font-size:15px classDef l2 fill:#1a7f72,stroke:#12695f,color:#fff,font-size:15px classDef l3 fill:#2a9d8f,stroke:#1f7a6f,color:#fff,font-size:15px classDef l4 fill:#5cbcb0,stroke:#3bab9d,color:#08312c,font-size:15px classDef l5 fill:#a7ddd5,stroke:#5cbcb0,color:#08312c,font-size:15px classDef rel fill:#e9a23b,stroke:#b8791f,color:#222,font-size:14px linkStyle default stroke:#999,stroke-width:2px