Name	Flags	Card.	Type	Description & Constraints
StructureDefinition	N		DomainResource	Structural Definition + Warning: Name should be usable as an identifier for the module by machine processing applications such as code generation + Rule: Element paths must be unique unless the structure is a constraint + Rule: If the first element in a differential has no "." in the path and it's not a logical model, it has no type + Rule: If the structure is not abstract, then there SHALL be a baseDefinition + Rule: If the structure defines an extension then the structure must have context information + Rule: A structure must have either a differential, or a snapshot (or both) + Rule: In any snapshot or differential, no label, code or requirements on an element without a "." in the path (e.g. the first element) + Rule: If there's a type, its content must match the path name in the first element of a snapshot + Rule: All element definitions must have an id + Rule: The first element in a snapshot has no type unless model is a logical model. + Rule: All element definitions must have unique ids (snapshot) + Rule: All element definitions must have unique ids (diff) + Rule: Context Invariants can only be used for extensions + Rule: FHIR Specification models only use FHIR defined types + Rule: Default values can only be specified on specializations + Rule: FHIR Specification models never have default values + Rule: No slice name on root Elements defined in Ancestors: id, meta, implicitRules, language, text, contained, extension, modifierExtension
url	Σ	1..1	uri	Canonical identifier for this structure definition, represented as a URI (globally unique)
identifier	Σ	0..*	Identifier	Additional identifier for the structure definition
version	Σ	0..1	string	Business version of the structure definition
name	Σ	1..1	string	Name for this structure definition (computer friendly)
title	Σ	0..1	string	Name for this structure definition (human friendly)
status	?! Σ	1..1	code	draft | active | retired | unknown PublicationStatus ( Required)
experimental	Σ	0..1	boolean	For testing purposes, not real usage
date	Σ	0..1	dateTime	Date last changed
publisher	Σ	0..1	string	Name of the publisher (organization or individual)
contact	Σ	0..*	ContactDetail	Contact details for the publisher
description		0..1	markdown	Natural language description of the structure definition
useContext	Σ TU	0..*	UsageContext	The context that the content is intended to support
jurisdiction	Σ	0..*	CodeableConcept	Intended jurisdiction for structure definition (if applicable) Jurisdiction ( Extensible)
purpose		0..1	markdown	Why this structure definition is defined
copyright		0..1	markdown	Use and/or publishing restrictions
keyword	Σ	0..*	Coding	Assist with indexing and finding Structure Definition Use Codes / Keywords ( Extensible)
fhirVersion	Σ	0..1	code	FHIR Version this StructureDefinition targets FHIRVersion ( Required)
mapping	I	0..*	BackboneElement	External specification that the content is mapped to + Rule: Must have at least a name or a uri (or both)
identity		1..1	id	Internal id when this mapping is used
uri	I	0..1	uri	Identifies what this mapping refers to
name	I	0..1	string	Names what this mapping refers to
comment		0..1	string	Versions, Issues, Scope limitations etc.
kind	Σ	1..1	code	primitive-type | complex-type | resource | logical StructureDefinitionKind ( Required)
abstract	Σ	1..1	boolean	Whether the structure is abstract
context	Σ I	0..*	BackboneElement	If an extension, where it can be used in instances
type	Σ	1..1	code	fhirpath | element | extension ExtensionContextType ( Required)
expression	Σ	1..1	string	Where the extension can be used in instances
contextInvariant	Σ I	0..*	string	FHIRPath invariants - when the extension can be used
type	Σ I	1..1	uri	Type defined or constrained by this structure FHIRDefinedType ( Extensible)
baseDefinition	Σ I	0..1	canonical( StructureDefinition)	Definition that this type is constrained/specialized from
derivation	Σ	0..1	code	specialization | constraint - How relates to base definition TypeDerivationRule ( Required)
snapshot	I	0..1	BackboneElement	Snapshot view of the structure + Rule: Each element definition in a snapshot must have a formal definition and cardinalities + Rule: All snapshot elements must start with the StructureDefinition's specified type for non-logical models, or with the same type name for logical models + Rule: For CodeableReference elements, target profiles must be listed on the CodeableReference, not the CodeableReference.reference + Rule: For CodeableReference elements, bindings must be listed on the CodeableReference, not the CodeableReference.concept + Rule: All snapshot elements must have a base definition
element	I	1..*	ElementDefinition	Definition of elements in the resource (if no StructureDefinition) + Rule: provide either a binding reference or a description (or both)
differential	I	0..1	BackboneElement	Differential view of the structure + Rule: No slicing on the root element + Rule: In any differential, all the elements must start with the StructureDefinition's specified type for non-logical models, or with the same type name for logical models
element		1..*	ElementDefinition	Definition of elements in the resource (if no StructureDefinition)
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