Name	Flags	Card.	Type	Description & Constraints
NamingSystem	I		DomainResource	System of unique identification Can't have more than one preferred identifier for a type Can only have replacedBy if naming system is retired Root systems cannot have uuid or sid identifiers
name		1..1	string	Human-readable label
status	?!	1..1	code	draft | active | retired ConformanceResourceStatus ( Required)
kind		1..1	code	codesystem | identifier | root NamingSystemType ( Required)
publisher	Σ	0..1	string	Name of the publisher (Organization or individual)
contact	Σ	0..*	BackboneElement	Contact details of the publisher
name	Σ	0..1	string	Name of a individual to contact
telecom	Σ	0..*	ContactPoint	Contact details for individual or publisher
responsible		0..1	string	Who maintains system namespace?
date	Σ	1..1	dateTime	Publication Date(/time)
type		0..1	CodeableConcept	e.g. driver, provider, patient, bank etc. Identifier Type Codes ( Extensible)
description		0..1	string	What does naming system identify?
useContext	Σ	0..*	CodeableConcept	Content intends to support these contexts Context of Use ValueSet ( Extensible)
usage		0..1	string	How/where is it used
uniqueId		1..*	BackboneElement	Unique identifiers used for system
type		1..1	code	oid | uuid | uri | other NamingSystemIdentifierType ( Required)
value		1..1	string	The unique identifier
preferred		0..1	boolean	Is this the id that should be used for this type
period		0..1	Period	When is identifier valid?
replacedBy	I	0..1	Reference( NamingSystem)	Use this instead
Documentation for this format