Optional
_systemOptional
_useusual | official | temp | secondary | old (If known)
Optional
_valueThe value that is unique
Optional
assignerOrganization that issued id (may be just text)
Optional
extensionAdditional content defined by implementations
Optional
idUnique id for inter-element referencing
Optional
periodTime period when id is/was valid for use
Optional
systemThe namespace for the identifier value
Optional
typeDescription of identifier
Optional
useusual | official | temp | secondary | old (If known)
Optional
valueThe value that is unique
The namespace for the identifier value