This is the set of resources that conform to either of the profiles Entry Resource Cross References (http://fhir.ch/ig/ch-core/StructureDefinition/ch-core-ext-entry-resource-cross-references) and Entry Resource Cross References (http://fhir.ch/ig/ch-core/StructureDefinition/ch-core-ext-entry-resource-cross-references). E.g. what you have to deal with if you get resources conforming to one of them
| Name | Flags | Card. | Type | Description & Constraints |
|---|---|---|---|---|
  Extension | 0..* | Entry Resource Cross References ele-1: All FHIR elements must have a @value or children ext-1: Must have either extensions or value[x], not both | ||
  extension | 3..* | Extension | Extension ele-1: All FHIR elements must have a @value or children ext-1: Must have either extensions or value[x], not both | |
  url | 1..1 | uri | identifies the meaning of the extension | |
| Documentation for this format | ||||