Unsupported Modifications
Unsupported modifications are modifications or extensions to the Ed-Fi model that are not supported as part of Ed-Fi core standards and technology. The list below should not be interpreted as a list of all unsupported extensions (only those items listed under Supported Extensions are supported); rather this list is provided to assist data modelers in their usage.
X.1. Addition Exceptions
Some entity types are reserved for the core data standard only and should not be added to extension projects. In these cases, other entity types should accommodate the majority of extension use cases and causes fewer issues in implementation.
Prohibited Type | Use Instead |
|---|---|
| Inline Common | Common |
| Enumeration | Descriptor |
X.2. Extension Exceptions
Only Domain Entities, Associations, and Common Types may be extended. No others may be extended.
The following exceptions apply to the extension of domain entities, associations, and common types.
Exception | Issue |
|---|---|
| Including required properties in extended domain entities, associations, or common types | ODS-2153 |
X.3. Subclass Extensions
Note that subclassing is limited to creation of subclasses of EducationOrganization and GeneralStudentProgramAssociation, per Section 3. Subclassing Existing Entities#3.1.SubclassDomainEntitiesandAssociations
Additional Information
Please note that the core Ed-Fi model does minimally employs subclassing, but constrains it usage to abstract entities for the core model. This restriction exists because this subclassing – while useful – has proven complex in downstream implementations. As a result subclassing is not supported more broadly in extensions at this time.
X.4. Interchange Inclusions
Only Domain Entities and Associations may be included in an Interchange. All others, such as common types or descriptors, may not be included directly in the interchange. However, they may be included in a domain entity or association (core or extended) and thus indirectly included in the interchange.
X.5. Modifying Core Elements
Modifying core data model element definitions is not allowed. Doing so would break client systems that rely on the core standard.
X.6. Removing Core Entities
Removing entities from a core product's data model is not allowed. Doing so would break client systems that rely on the core standard.
X.7. Removing Required Elements
Removing elements from a core product's data model is not allowed. Doing so would break client systems that rely on the core standard.
X.8. Change Optional Core Element to Required
Optional core elements may not be changed to mandatory. Doing so would break client systems built on the core standard.
X.9. Change Optional Core Collection to Required
Optional collections in core may not be changed to mandatory. Doing so would break client systems built in the core standard.