Extensions

Extension	I		Extension	There are no (further) constraints on this element Element id Extension Short description Preferred method for communication Definition .... Data type Extension Constraints ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()` Mappings rim: N/A
url			Fixed Value	There are no (further) constraints on this element Element id Extension.url Fixed value http://example.org/fhir/StructureDefinition/Preferred%20Communication%20Method
valueCoding			Coding	There are no (further) constraints on this element Element id Extension.value[x]:valueCoding Short description Method Data type Coding
code		1..	Binding	There are no (further) constraints on this element Element id Extension.value[x]:valueCoding.code Binding ?? (required)