| Source Element | Usage | Target |
| CatalogEntry | UseExtension | http://hl7.org/fhir/4.3/StructureDefinition/extension-CatalogEntry |
| CatalogEntry.id | UseExtensionFromAncestor | - |
| CatalogEntry.meta | UseExtensionFromAncestor | - |
| CatalogEntry.implicitRules | UseExtensionFromAncestor | - |
| CatalogEntry.language | UseExtensionFromAncestor | - |
| CatalogEntry.text | UseExtensionFromAncestor | - |
| CatalogEntry.contained | UseExtensionFromAncestor | - |
| CatalogEntry.extension | UseExtensionFromAncestor | - |
| CatalogEntry.modifierExtension | UseExtensionFromAncestor | - |
| CatalogEntry.identifier | UseExtensionFromAncestor | - |
| CatalogEntry.type | UseExtensionFromAncestor | - |
| CatalogEntry.orderable | UseExtensionFromAncestor | - |
| CatalogEntry.referencedItem | UseExtensionFromAncestor | - |
| CatalogEntry.additionalIdentifier | UseExtensionFromAncestor | - |
| CatalogEntry.classification | UseExtensionFromAncestor | - |
| CatalogEntry.status | UseExtensionFromAncestor | - |
| CatalogEntry.validityPeriod | UseExtensionFromAncestor | - |
| CatalogEntry.validTo | UseExtensionFromAncestor | - |
| CatalogEntry.lastUpdated | UseExtensionFromAncestor | - |
| CatalogEntry.additionalCharacteristic | UseExtensionFromAncestor | - |
| CatalogEntry.additionalClassification | UseExtensionFromAncestor | - |
| CatalogEntry.relatedEntry | UseExtensionFromAncestor | - |
| CatalogEntry.relatedEntry.id | UseExtensionFromAncestor | - |
| CatalogEntry.relatedEntry.extension | UseExtensionFromAncestor | - |
| CatalogEntry.relatedEntry.modifierExtension | UseExtensionFromAncestor | - |
| CatalogEntry.relatedEntry.relationtype | UseExtensionFromAncestor | - |
| CatalogEntry.relatedEntry.item | UseExtensionFromAncestor | - |