| Source Element | Usage | Target |
| MessageDefinition.id | UseElementSameName | MessageDefinition.id |
| MessageDefinition.meta | UseElementSameName | MessageDefinition.meta |
| MessageDefinition.implicitRules | UseElementSameName | MessageDefinition.implicitRules |
| MessageDefinition.language | UseElementSameName | MessageDefinition.language |
| MessageDefinition.text | UseElementSameName | MessageDefinition.text |
| MessageDefinition.contained | UseElementSameName | MessageDefinition.contained |
| MessageDefinition.extension | UseElementSameName | MessageDefinition.extension |
| MessageDefinition.modifierExtension | UseElementSameName | MessageDefinition.modifierExtension |
| MessageDefinition.url | UseElementSameName | MessageDefinition.url |
| MessageDefinition.identifier | UseElementSameName | MessageDefinition.identifier |
| MessageDefinition.version | UseElementSameName | MessageDefinition.version |
| MessageDefinition.name | UseElementSameName | MessageDefinition.name |
| MessageDefinition.title | UseElementSameName | MessageDefinition.title |
| MessageDefinition.replaces | UseElementSameName | MessageDefinition.replaces |
| MessageDefinition.status | UseElementSameName | MessageDefinition.status |
| MessageDefinition.experimental | UseElementSameName | MessageDefinition.experimental |
| MessageDefinition.date | UseElementSameName | MessageDefinition.date |
| MessageDefinition.publisher | UseElementSameName | MessageDefinition.publisher |
| MessageDefinition.contact | UseElementSameName | MessageDefinition.contact |
| MessageDefinition.description | UseElementSameName | MessageDefinition.description |
| MessageDefinition.useContext | UseElementSameName | MessageDefinition.useContext |
| MessageDefinition.jurisdiction | UseElementSameName | MessageDefinition.jurisdiction |
| MessageDefinition.purpose | UseElementSameName | MessageDefinition.purpose |
| MessageDefinition.copyright | UseElementSameName | MessageDefinition.copyright |
| MessageDefinition.base | UseElementSameName | MessageDefinition.base |
| MessageDefinition.parent | UseElementSameName | MessageDefinition.parent |
| MessageDefinition.event[x] | UseElementSameName | MessageDefinition.event[x] |
| MessageDefinition.category | UseElementSameName | MessageDefinition.category |
| MessageDefinition.focus | UseElementSameName | MessageDefinition.focus |
| MessageDefinition.focus.id | UseElementSameName | MessageDefinition.focus.id |
| MessageDefinition.focus.extension | UseElementSameName | MessageDefinition.focus.extension |
| MessageDefinition.focus.modifierExtension | UseElementSameName | MessageDefinition.focus.modifierExtension |
| MessageDefinition.focus.code | UseExtension | http://hl7.org/fhir/4.0/StructureDefinition/extension-MessageDefinition.focus.code |
| MessageDefinition.focus.profile | UseElementSameName | MessageDefinition.focus.profile |
| MessageDefinition.focus.min | UseElementSameName | MessageDefinition.focus.min |
| MessageDefinition.focus.max | UseElementSameName | MessageDefinition.focus.max |
| MessageDefinition.responseRequired | UseElementSameName | MessageDefinition.responseRequired |
| MessageDefinition.allowedResponse | UseElementSameName | MessageDefinition.allowedResponse |
| MessageDefinition.allowedResponse.id | UseElementSameName | MessageDefinition.allowedResponse.id |
| MessageDefinition.allowedResponse.extension | UseElementSameName | MessageDefinition.allowedResponse.extension |
| MessageDefinition.allowedResponse.modifierExtension | UseElementSameName | MessageDefinition.allowedResponse.modifierExtension |
| MessageDefinition.allowedResponse.message | UseElementSameName | MessageDefinition.allowedResponse.message |
| MessageDefinition.allowedResponse.situation | UseElementSameName | MessageDefinition.allowedResponse.situation |
| MessageDefinition.graph | UseElementSameName | MessageDefinition.graph |