http://hl7.org/fhir/StructureDefinition/Extension|4.0.1

Base StructureDefinition for Extension Type: Optional Extension Element - found in all resources.

element_id	types
Extension
Extension.url	http://hl7.org/fhirpath/System.String
Extension.value[x]	base64Binary,boolean,canonical,code,date,dateTime,decimal,id,instant,integer,markdown,oid,positiveInt,string,time,unsignedInt,uri,url,uuid,Address,Age,Annotation,Attachment,CodeableConcept,Coding,ContactPoint,Count,Distance,Duration,HumanName,Identifier,Money,Period,Quantity,Range,Ratio,Reference,SampledData,Signature,Timing,ContactDetail,Contributor,DataRequirement,Expression,ParameterDefinition,RelatedArtifact,TriggerDefinition,UsageContext,Dosage,Meta
Extension
Extension.id	http://hl7.org/fhirpath/System.String
Extension.extension	Extension
Extension.url	http://hl7.org/fhirpath/System.String
Extension.value[x]	base64Binary,boolean,canonical,code,date,dateTime,decimal,id,instant,integer,markdown,oid,positiveInt,string,time,unsignedInt,uri,url,uuid,Address,Age,Annotation,Attachment,CodeableConcept,Coding,ContactPoint,Count,Distance,Duration,HumanName,Identifier,Money,Period,Quantity,Range,Ratio,Reference,SampledData,Signature,Timing,ContactDetail,Contributor,DataRequirement,Expression,ParameterDefinition,RelatedArtifact,TriggerDefinition,UsageContext,Dosage,Meta