Extension ele-1: All FHIR elements must have a @value or children
ext-1: Must have either extensions or value[x], not both
url 
value[x] ele-1: All FHIR elements must have a @value or children
Documentation for this formatThis is the set of resources that conform to both Observation Precondition (http://hl7.org/fhir/StructureDefinition/observation-precondition) and Observation Precondition (http://hl7.org/fhir/StructureDefinition/observation-precondition).
| Name | Flags | Card. | Type | Description & Constraints |
|---|---|---|---|---|
| Extension | 0..* | Other Observations needed to understand the context and significance of the source observation. 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 | |
| value[x] | 1..1 | Reference(Observation) | Value of extension ele-1: All FHIR elements must have a @value or children | |
| Documentation for this format | ||||