| Source Element | Usage | Target |
| ResearchDefinition | UseExtension | http://hl7.org/fhir/4.0/StructureDefinition/extension-ResearchDefinition |
| ResearchDefinition.id | UseExtensionFromAncestor | - |
| ResearchDefinition.meta | UseExtensionFromAncestor | - |
| ResearchDefinition.implicitRules | UseExtensionFromAncestor | - |
| ResearchDefinition.language | UseExtensionFromAncestor | - |
| ResearchDefinition.text | UseExtensionFromAncestor | - |
| ResearchDefinition.contained | UseExtensionFromAncestor | - |
| ResearchDefinition.extension | UseExtensionFromAncestor | - |
| ResearchDefinition.modifierExtension | UseExtensionFromAncestor | - |
| ResearchDefinition.url | UseExtensionFromAncestor | - |
| ResearchDefinition.identifier | UseExtensionFromAncestor | - |
| ResearchDefinition.version | UseExtensionFromAncestor | - |
| ResearchDefinition.name | UseExtensionFromAncestor | - |
| ResearchDefinition.title | UseExtensionFromAncestor | - |
| ResearchDefinition.shortTitle | UseExtensionFromAncestor | - |
| ResearchDefinition.subtitle | UseExtensionFromAncestor | - |
| ResearchDefinition.status | UseExtensionFromAncestor | - |
| ResearchDefinition.experimental | UseExtensionFromAncestor | - |
| ResearchDefinition.subject[x] | UseExtensionFromAncestor | - |
| ResearchDefinition.date | UseExtensionFromAncestor | - |
| ResearchDefinition.publisher | UseExtensionFromAncestor | - |
| ResearchDefinition.contact | UseExtensionFromAncestor | - |
| ResearchDefinition.description | UseExtensionFromAncestor | - |
| ResearchDefinition.comment | UseExtensionFromAncestor | - |
| ResearchDefinition.useContext | UseExtensionFromAncestor | - |
| ResearchDefinition.jurisdiction | UseExtensionFromAncestor | - |
| ResearchDefinition.purpose | UseExtensionFromAncestor | - |
| ResearchDefinition.usage | UseExtensionFromAncestor | - |
| ResearchDefinition.copyright | UseExtensionFromAncestor | - |
| ResearchDefinition.approvalDate | UseExtensionFromAncestor | - |
| ResearchDefinition.lastReviewDate | UseExtensionFromAncestor | - |
| ResearchDefinition.effectivePeriod | UseExtensionFromAncestor | - |
| ResearchDefinition.topic | UseExtensionFromAncestor | - |
| ResearchDefinition.author | UseExtensionFromAncestor | - |
| ResearchDefinition.editor | UseExtensionFromAncestor | - |
| ResearchDefinition.reviewer | UseExtensionFromAncestor | - |
| ResearchDefinition.endorser | UseExtensionFromAncestor | - |
| ResearchDefinition.relatedArtifact | UseExtensionFromAncestor | - |
| ResearchDefinition.library | UseExtensionFromAncestor | - |
| ResearchDefinition.population | UseExtensionFromAncestor | - |
| ResearchDefinition.exposure | UseExtensionFromAncestor | - |
| ResearchDefinition.exposureAlternative | UseExtensionFromAncestor | - |
| ResearchDefinition.outcome | UseExtensionFromAncestor | - |