Name	Flags	Card.	Type	Description & Constraints
ElementDefinition	Σ N		Element	Definition of an element in a resource or extension + Rule: Min <= Max + Rule: if the element definition has a contentReference, it cannot have type, defaultValue, fixed, pattern, example, minValue, maxValue, maxLength, or binding + Rule: Fixed value may only be specified if there is one type + Rule: Pattern may only be specified if there is one type + Rule: Pattern and fixed are mutually exclusive + Rule: Binding can only be present for coded elements, string, and uri if using FHIR-defined types + Rule: Types must be unique by code + Rule: Constraints must be unique by key + Rule: default value and meaningWhenMissing are mutually exclusive + Rule: sliceName must be composed of proper tokens separated by "/" + Rule: Must have a modifier reason if isModifier = true + Rule: Element path SHALL be expressed as a set of '.'-separated components with each component restricted to a maximum of 64 characters and with some limits on the allowed choice of characters + Warning: The first component of the path should be UpperCamelCase. Additional components (following a '.') should be lowerCamelCase. If this syntax is not adhered to, code generation tools may be broken. Logical models may be less concerned about this implication. + Rule: sliceIsConstraining can only appear if slicename is present + Guideline: pattern[x] should be used rather than fixed[x] + Warning: Order has no meaning (and cannot be asserted to have meaning), so enforcing rules on order is improper + Warning: Mappings SHOULD be unique by key + Rule: Can't have valueAlternatives if mustHaveValue is true Elements defined in Ancestors: id, extension, modifierExtension
path	Σ C	1..1	string	Path of the element in the hierarchy of elements
representation	Σ	0..*	code	xmlAttr | xmlText | typeAttr | cdaText | xhtml Binding: PropertyRepresentation ( Required)
sliceName	Σ C	0..1	string	Name for this particular element (in a set of slices)
sliceIsConstraining	Σ C TU	0..1	boolean	If this slice definition constrains an inherited slice definition (or not)
label	Σ T	0..1	string	Name for element to display with or prompt for element
code	Σ	0..*	Coding	Corresponding codes in terminologies Binding: ElementDefinitionCode ( Example)
slicing	Σ C	0..1	Element	This element is sliced - slices follow
discriminator	Σ	0..*	Element	Element values that are used to distinguish the slices
type	Σ	1..1	code	value | exists | type | profile | position Binding: DiscriminatorType ( Required)
path	Σ	1..1	string	Path to element value
description	Σ T	0..1	string	Text description of how slicing works (or not)
ordered	Σ C	0..1	boolean	If elements must be in same order as slices
rules	Σ C	1..1	code	closed | open | openAtEnd Binding: SlicingRules ( Required)
short	Σ T	0..1	string	Concise definition for space-constrained presentation
definition	Σ T	0..1	markdown	Full formal definition as narrative text
comment	Σ T	0..1	markdown	Comments about the use of this element
requirements	Σ T	0..1	markdown	Why this resource has been created
alias	Σ T	0..*	string	Other names
min	Σ C	0..1	unsignedInt	Minimum Cardinality
max	Σ C	0..1	string	Maximum Cardinality (a number or *) + Rule: Max SHALL be a number or "*"
base	Σ	0..1	Element	Base definition information for tools
path	Σ	1..1	string	Path that identifies the base element
min	Σ	1..1	unsignedInt	Min cardinality of the base element
max	Σ	1..1	string	Max cardinality of the base element
contentReference	Σ C	0..1	uri	Reference to definition of content for the element
type	Σ C	0..*	Element	Data type and Profile for this element + Rule: Aggregation may only be specified if one of the allowed types for the element is a reference + Rule: targetProfile is only allowed if the type is Reference or canonical
code	Σ C	1..1	uri	Data type or Resource (reference to definition) Binding: Element Definition Types ( Extensible)
profile	Σ	0..*	canonical( StructureDefinition | ImplementationGuide)	Profiles (StructureDefinition or IG) - one must apply
targetProfile	Σ C	0..*	canonical( StructureDefinition | ImplementationGuide)	Profile (StructureDefinition or IG) on the Reference/canonical target - one must apply
aggregation	Σ C	0..*	code	contained | referenced | bundled - how aggregated Binding: AggregationMode ( Required)
versioning	Σ	0..1	code	either | independent | specific Binding: ReferenceVersionRules ( Required)
defaultValue[x]	Σ C	0..1	*	Specified value if missing from instance
meaningWhenMissing	Σ T C	0..1	markdown	Implicit meaning when this element is missing
orderMeaning	Σ C	0..1	string	What the order of the elements means
fixed[x]	Σ C	0..1	*	Value must be exactly this
pattern[x]	Σ C	0..1	*	Value must have at least these property values
example	Σ C	0..*	Element	Example value (as defined for type)
label	Σ T	1..1	string	Describes the purpose of this example
value[x]	Σ	1..1	*	Value of Example (one of allowed types)
minValue[x]	Σ C	0..1		Minimum Allowed Value (for some types)
minValueDate			date
minValueDateTime			dateTime
minValueInstant			instant
minValueTime			time
minValueDecimal			decimal
minValueInteger			integer
minValueInteger64			integer64
minValuePositiveInt			positiveInt
minValueUnsignedInt			unsignedInt
minValueQuantity			Quantity
maxValue[x]	Σ C	0..1		Maximum Allowed Value (for some types)
maxValueDate			date
maxValueDateTime			dateTime
maxValueInstant			instant
maxValueTime			time
maxValueDecimal			decimal
maxValueInteger			integer
maxValueInteger64			integer64
maxValuePositiveInt			positiveInt
maxValueUnsignedInt			unsignedInt
maxValueQuantity			Quantity
maxLength	Σ C	0..1	integer	Max length for string type data
condition	Σ	0..*	id	Reference to invariant about presence
constraint	Σ C	0..*	Element	Condition that must evaluate to true + Warning: Constraints should have an expression or else validators will not be able to enforce them + Rule: Errors cannot be suppressed
key	Σ C	1..1	id	Target of 'condition' reference above
requirements	Σ	0..1	markdown	Why this constraint is necessary or appropriate
severity	Σ C	1..1	code	error | warning Binding: ConstraintSeverity ( Required)
suppress	Σ C TU	0..1	boolean	Suppress warning or hint in profile
human	Σ T	1..1	string	Human description of constraint
expression	Σ C	0..1	string	FHIRPath expression of constraint
source	Σ	0..1	canonical( StructureDefinition)	Reference to original source of constraint
mustHaveValue	Σ C TU	0..1	boolean	For primitives, that a value must be present - not replaced by an extension
valueAlternatives	Σ C TU	0..*	canonical( StructureDefinition)	Extensions that are allowed to replace a primitive value
mustSupport	Σ	0..1	boolean	If the element must be supported (discouraged - see obligations)
isModifier	Σ C	0..1	boolean	If this modifies the meaning of other elements
isModifierReason	Σ C	0..1	string	Reason that this element is marked as a modifier
isSummary	Σ	0..1	boolean	Include when _summary = true?
binding	Σ C	0..1	Element	ValueSet details if this is coded + Rule: ValueSet SHALL start with http:// or https:// or urn: or # + Rule: binding SHALL have either description or valueSet
strength	Σ	1..1	code	required | extensible | preferred | example Binding: BindingStrength ( Required)
description	Σ T C	0..1	markdown	Intended use of codes in the bound value set
valueSet	Σ C	0..1	canonical( ValueSet)	Source of value set
additional	Σ TU	0..*	Element	Additional Bindings - more rules about the binding
purpose	Σ	1..1	code	maximum | minimum | required | extensible | candidate | current | preferred | ui | starter | component Binding: Additional Binding Purpose ValueSet ( Required)
valueSet	Σ	1..1	canonical( ValueSet)	The value set for the additional binding
documentation	Σ	0..1	markdown	Documentation of the purpose of use of the binding
shortDoco	Σ	0..1	string	Concise documentation - for summary tables
usage	Σ	0..*	UsageContext	Qualifies the usage - jurisdiction, gender, workflow status etc.
any	Σ	0..1	boolean	Whether binding can applies to all repeats, or just one
mapping	Σ C	0..*	Element	Map element to another set of definitions
identity	Σ C	1..1	id	Reference to mapping declaration
language	Σ	0..1	code	Computable language of mapping Binding: Mime Types ( Required)
map	Σ	1..1	string	Details of the mapping
comment	Σ	0..1	markdown	Comments about the mapping or its use
Documentation for this format