| Source Element | Usage | Target |
| ObservationDefinition.id | UseElementSameName | ObservationDefinition.id |
| ObservationDefinition.meta | UseElementSameName | ObservationDefinition.meta |
| ObservationDefinition.implicitRules | UseElementSameName | ObservationDefinition.implicitRules |
| ObservationDefinition.language | UseElementSameName | ObservationDefinition.language |
| ObservationDefinition.text | UseElementSameName | ObservationDefinition.text |
| ObservationDefinition.contained | UseElementSameName | ObservationDefinition.contained |
| ObservationDefinition.extension | UseElementSameName | ObservationDefinition.extension |
| ObservationDefinition.modifierExtension | UseElementSameName | ObservationDefinition.modifierExtension |
| ObservationDefinition.url | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.url |
| ObservationDefinition.identifier | UseElementSameName | ObservationDefinition.identifier |
| ObservationDefinition.version | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.version |
| ObservationDefinition.versionAlgorithm[x] | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.versionAlgorithm |
| ObservationDefinition.name | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.name |
| ObservationDefinition.title | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.title |
| ObservationDefinition.status | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.status |
| ObservationDefinition.experimental | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.experimental |
| ObservationDefinition.date | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.date |
| ObservationDefinition.publisher | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.publisher |
| ObservationDefinition.contact | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.contact |
| ObservationDefinition.description | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.description |
| ObservationDefinition.useContext | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.useContext |
| ObservationDefinition.jurisdiction | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.jurisdiction |
| ObservationDefinition.purpose | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.purpose |
| ObservationDefinition.copyright | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.copyright |
| ObservationDefinition.copyrightLabel | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.copyrightLabel |
| ObservationDefinition.approvalDate | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.approvalDate |
| ObservationDefinition.lastReviewDate | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.lastReviewDate |
| ObservationDefinition.effectivePeriod | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.effectivePeriod |
| ObservationDefinition.derivedFromCanonical | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.derivedFromCanonical |
| ObservationDefinition.derivedFromUri | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.derivedFromUri |
| ObservationDefinition.subject | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.subject |
| ObservationDefinition.performerType | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.performerType |
| ObservationDefinition.category | UseElementSameName | ObservationDefinition.category |
| ObservationDefinition.code | UseElementSameName | ObservationDefinition.code |
| ObservationDefinition.permittedDataType | UseElementSameName | ObservationDefinition.permittedDataType |
| ObservationDefinition.multipleResultsAllowed | UseElementSameName | ObservationDefinition.multipleResultsAllowed |
| ObservationDefinition.bodySite | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.bodySite |
| ObservationDefinition.method | UseElementSameName | ObservationDefinition.method |
| ObservationDefinition.specimen | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.specimen |
| ObservationDefinition.device | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.device |
| ObservationDefinition.preferredReportName | UseElementSameName | ObservationDefinition.preferredReportName |
| ObservationDefinition.permittedUnit | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.permittedUnit |
| ObservationDefinition.qualifiedValue | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.qualifiedValue |
| ObservationDefinition.qualifiedValue.id | UseExtensionFromAncestor | - |
| ObservationDefinition.qualifiedValue.extension | UseExtensionFromAncestor | - |
| ObservationDefinition.qualifiedValue.modifierExtension | UseExtensionFromAncestor | - |
| ObservationDefinition.qualifiedValue.context | UseExtensionFromAncestor | - |
| ObservationDefinition.qualifiedValue.appliesTo | UseExtensionFromAncestor | - |
| ObservationDefinition.qualifiedValue.gender | UseExtensionFromAncestor | - |
| ObservationDefinition.qualifiedValue.age | UseExtensionFromAncestor | - |
| ObservationDefinition.qualifiedValue.gestationalAge | UseExtensionFromAncestor | - |
| ObservationDefinition.qualifiedValue.condition | UseExtensionFromAncestor | - |
| ObservationDefinition.qualifiedValue.rangeCategory | UseExtensionFromAncestor | - |
| ObservationDefinition.qualifiedValue.range | UseExtensionFromAncestor | - |
| ObservationDefinition.qualifiedValue.validCodedValueSet | UseExtensionFromAncestor | - |
| ObservationDefinition.qualifiedValue.normalCodedValueSet | UseExtensionFromAncestor | - |
| ObservationDefinition.qualifiedValue.abnormalCodedValueSet | UseExtensionFromAncestor | - |
| ObservationDefinition.qualifiedValue.criticalCodedValueSet | UseExtensionFromAncestor | - |
| ObservationDefinition.hasMember | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.hasMember |
| ObservationDefinition.component | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-ObservationDefinition.component |
| ObservationDefinition.component.id | UseExtensionFromAncestor | - |
| ObservationDefinition.component.extension | UseExtensionFromAncestor | - |
| ObservationDefinition.component.modifierExtension | UseExtensionFromAncestor | - |
| ObservationDefinition.component.code | UseExtensionFromAncestor | - |
| ObservationDefinition.component.permittedDataType | UseExtensionFromAncestor | - |
| ObservationDefinition.component.permittedUnit | UseExtensionFromAncestor | - |
| ObservationDefinition.component.qualifiedValue | UseExtensionFromAncestor | - |