This structure is derived from Group.

Summary

Mandatory: 2 elements
Fixed Value: 1 element

This indicates the differences between this profile and the base Group structure.

Name	Flags	Card.	Type	Description & Constraints
Group		1..1	Group	Group of multiple entities
membership		1..1	code	definitional | conceptual | enumerated Fixed Value: definitional
characteristic		1..*	BackboneElement	Include / Exclude group members by Trait
Documentation for this format

This provides the consolidated view (aka snapshot) of the profile after applying the changes in this profile to the base Group structure.

Name	Flags	Card.	Type	Description & Constraints
Group	C	1..1	Group	Group of multiple entities cnl-2: Group.type SHALL be defined if Group.membership is either 'definitional' or 'enumerated'
id	Σ	0..1	id	Logical id of this artifact
meta	Σ	0..1	Meta	Metadata about the resource
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
language		0..1	code	Language of the resource content Binding: All Languages (required): IETF language tag for a human language Additional Bindings Purpose Common Languages Starter Set
text		0..1	Narrative	Text summary of the resource, for human interpretation
contained		0..*	Resource	Contained, inline Resources
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored
url	ΣC	0..1	uri	Canonical identifier for this Group, represented as an absolute URI (globally unique) cnl-1: URL should not contain | or # - these characters make processing canonical references problematic
identifier	Σ	0..*	Identifier	Business Identifier for this Group
version	Σ	0..1	string	Business version of the Group
versionAlgorithm[x]	Σ	0..1		How to compare versions Binding: Version Algorithm (extensible)
versionAlgorithmString			string
versionAlgorithmCoding			Coding
name	Σ	0..1	string	Label for Group
title	Σ	0..1	string	Name for this Group (human friendly)
status	?!Σ	0..1	code	draft | active | retired | unknown Binding: PublicationStatus (required): The lifecycle status of an artifact.
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/steward (organization or individual)
contact	Σ	0..*	ContactDetail	Contact details for the publisher
description		0..1	markdown	Natural language description of the group
useContext	Σ	0..*	UsageContext	The context that the content is intended to support
purpose		0..1	markdown	Why this Group is defined
copyright		0..1	markdown	Use and/or publishing restrictions
copyrightLabel		0..1	string	Copyright holder and year(s)
type	Σ	0..1	code	person | animal | practitioner | device | careteam | healthcareservice | location | organization | relatedperson | specimen Binding: Group Type (required): Types of resources that are part of group.
membership	Σ	1..1	code	definitional | conceptual | enumerated Binding: Group Membership Basis (required): The basis for membership in a group Fixed Value: definitional
code	Σ	0..1	CodeableConcept	Use of the Group (and by implication, kind of members) Binding: Group Code (extensible): A code that describes the kind of group, which usually dictates what kind if entities can be in the group.
quantity	Σ	0..1	unsignedInt	Number of members
managingEntity	Σ	0..1	Reference(Organization | RelatedPerson | Practitioner | PractitionerRole)	Entity that is the custodian of the Group's definition
combinationMethod	?!Σ	0..1	code	all-of | any-of | at-least | at-most | except-subset Binding: Group Characteristic Combination (required)
combinationThreshold		0..1	positiveInt	Provides the value of "n" when "at-least" or "at-most" codes are used
characteristic	Σ	1..*	BackboneElement	Include / Exclude group members by Trait
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code	Σ	1..1	CodeableConcept	Kind of characteristic Binding Description (No ValueSet): (example): List of characteristics used to describe group members; e.g. gender, age, owner, location, etc.
value[x]	Σ	1..1		Value held by characteristic Binding Description (No ValueSet): (example): Value of descriptive member characteristic; e.g. red, male, pneumonia, Caucasian, etc.
valueCodeableConcept			CodeableConcept
valueBoolean			boolean
valueQuantity			Quantity
valueRange			Range
valueReference			Reference(Any)
valueUri			uri
valueExpression			Expression
exclude	Σ	1..1	boolean	Group includes or excludes
description		0..1	markdown	Natural language description of the characteristic
method		0..*	CodeableConcept	Method for how the characteristic value was determined Binding: Definition Method (example)
determinedBy[x]		0..1		Defines the characteristic
determinedByReference			Reference(Device | DeviceDefinition | DeviceMetric)
determinedByExpression			Expression
offset	?!Σ	0..1	CodeableConcept	Reference point for comparison Binding: Characteristic Offset (example)
instances[x]		0..1		Number of occurrences meeting the characteristic
instancesQuantity			Quantity
instancesRange			Range
duration[x]		0..1		Length of time in which the characteristic is met
durationDuration			Duration
durationRange			Range
period		0..1	Period	Period over which characteristic is tested
timing		0..*	RelativeTime	Timing in which the characteristic is determined
member		0..*	BackboneElement	Who or what is in group
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
entity		1..1	Reference(CareTeam | Device | Group | HealthcareService | Location | Organization | Patient | Practitioner | PractitionerRole | RelatedPerson | Specimen)	Reference to the group member
involvement		0..*	CodeableConcept	Code that describes how user is part of the group Binding: Group Involvement (example): A code that describes how a user is involved in the group
period		0..1	Period	Period member belonged to the group
inactive		0..1	boolean	If member is no longer in group
Documentation for this format

<!-- GroupDefinition -->

<Group xmlns="http://hl7.org/fhir"
>
  <!-- from Element: extension -->
 <id value="[id]"/><!-- 0..1 Logical id of this artifact -->
 <meta><!-- I 0..1 Meta Metadata about the resource --></meta>
 <implicitRules value="[uri]"/><!-- I 0..1 A set of rules under which this content was created -->
 <language value="[code]"/><!-- I 0..1 Language of the resource content   -->
 <text><!-- I 0..1 Narrative Text summary of the resource, for human interpretation --></text>
 <contained><!-- 0..* Resource Contained, inline Resources --></contained>
 <modifierExtension><!-- I 0..* Extension  Extensions that cannot be ignored  --></modifierExtension>
 <url value="[uri]"/><!-- I 0..1 Canonical identifier for this Group, represented as an absolute URI (globally unique) -->
 <identifier><!-- I 0..* Identifier Business Identifier for this Group --></identifier>
 <version value="[string]"/><!-- I 0..1 Business version of the Group -->
 <versionAlgorithm[x]><!-- I 0..1 string|Coding How to compare versions   --></versionAlgorithm[x]>
 <name value="[string]"/><!-- I 0..1 Label for Group -->
 <title value="[string]"/><!-- I 0..1 Name for this Group (human friendly) -->
 <status value="[code]"/><!-- I 0..1 draft | active | retired | unknown   -->
 <experimental value="[boolean]"/><!-- I 0..1 For testing purposes, not real usage -->
 <date value="[dateTime]"/><!-- I 0..1 Date last changed -->
 <publisher value="[string]"/><!-- I 0..1 Name of the publisher/steward (organization or individual) -->
 <contact><!-- I 0..* ContactDetail Contact details for the publisher --></contact>
 <description value="[markdown]"/><!-- I 0..1 Natural language description of the group -->
 <useContext><!-- I 0..* UsageContext 
     The context that the content is intended to support --></useContext>
 <purpose value="[markdown]"/><!-- I 0..1 Why this Group is defined -->
 <copyright value="[markdown]"/><!-- I 0..1 Use and/or publishing restrictions -->
 <copyrightLabel value="[string]"/><!-- I 0..1 Copyright holder and year(s) -->
 <type value="[code]"/><!-- I 0..1 person | animal | practitioner | device | careteam | healthcareservice | location | organization | relatedperson | specimen   -->
 <membership value="[code]"/><!-- I 1..1 definitional | conceptual | enumerated   -->
 <code><!-- I 0..1 CodeableConcept Use of the Group (and by implication, kind of members)   --></code>
 <quantity value="[unsignedInt]"/><!-- I 0..1 Number of members -->
 <managingEntity><!-- I 0..1 Reference(Organization) 
     Entity that is the custodian of the Group's definition --></managingEntity>
 <combinationMethod value="[code]"/><!-- I 0..1 all-of | any-of | at-least | at-most | except-subset   -->
 <combinationThreshold value="[positiveInt]"/><!-- I 0..1 Provides the value of "n" when "at-least" or "at-most" codes are used -->
 <characteristic> I 1..* BackboneElement  <!-- I 1..* Include / Exclude group members by Trait -->
  <modifierExtension><!-- I 0..* Extension  Extensions that cannot be ignored even if unrecognized  --></modifierExtension>
  <code><!-- I 1..1 CodeableConcept 
      Kind of characteristic --></code>
  <value[x]><!-- I 1..1 CodeableConcept|boolean|Quantity|
    Range|Reference|uri|Expression Value held by characteristic --></value[x]>
  <exclude value="[boolean]"/><!-- I 1..1 Group includes or excludes -->
  <description value="[markdown]"/><!-- I 0..1 Natural language description of the characteristic -->
  <method><!-- I 0..* CodeableConcept Method for how the characteristic value was determined   --></method>
  <determinedBy[x]><!-- I 0..1 Reference(Device)|Expression 
      Defines the characteristic --></determinedBy[x]>
  <offset><!-- I 0..1 CodeableConcept Reference point for comparison   --></offset>
  <instances[x]><!-- I 0..1 Quantity|Range 
      Number of occurrences meeting the characteristic --></instances[x]>
  <duration[x]><!-- I 0..1 Duration|Range 
      Length of time in which the characteristic is met --></duration[x]>
  <period><!-- I 0..1 Period 
      Period over which characteristic is tested --></period>
  <timing><!-- I 0..* RelativeTime 
      Timing in which the characteristic is determined --></timing>
 </characteristic>
 <member> I 0..* BackboneElement  <!-- I 0..* Who or what is in group -->
  <modifierExtension><!-- I 0..* Extension  Extensions that cannot be ignored even if unrecognized  --></modifierExtension>
  <entity><!-- I 1..1 Reference(CareTeam) Reference to the group member --></entity>
  <involvement><!-- I 0..* CodeableConcept Code that describes how user is part of the group   --></involvement>
  <period><!-- I 0..1 Period Period member belonged to the group --></period>
  <inactive value="[boolean]"/><!-- I 0..1 If member is no longer in group -->
 </member>
</Group>

{ // GroupDefinition
  // from Element: extension
    "meta" : { Meta }, // IMetadata about the resource
    "implicitRules" : "<uri>", // IA set of rules under which this content was created
    "language" : "<code>", // ILanguage of the resource content
    "text" : { Narrative }, // IText summary of the resource, for human interpretation
    "contained" : [{ Resource }], //Contained, inline Resources
    "modifierExtension" : [{ Extension }], // IExtensions that cannot be ignored
    "url" : "<uri>", // ICanonical identifier for this Group, represented as an absolute URI (globally unique)
    "identifier" : [{ Identifier }], // IBusiness Identifier for this Group
    "version" : "<string>", // IBusiness version of the Group
  // value[x]: How to compare versions. One of these 2:
    "versionAlgorithmString" : "<string>", // IHow to compare versions
    "versionAlgorithmCoding" : { Coding }, // IHow to compare versions
    "name" : "<string>", // ILabel for Group
    "title" : "<string>", // IName for this Group (human friendly)
    "status" : "<code>", // Idraft | active | retired | unknown
    "experimental" : <boolean>, // IFor testing purposes, not real usage
    "date" : "<dateTime>", // IDate last changed
    "publisher" : "<string>", // IName of the publisher/steward (organization or individual)
    "contact" : [{ ContactDetail }], // IContact details for the publisher
    "description" : "<markdown>", // INatural language description of the group
    "useContext" : [{ UsageContext }], // IThe context that the content is intended to support
    "purpose" : "<markdown>", // IWhy this Group is defined
    "copyright" : "<markdown>", // IUse and/or publishing restrictions
    "copyrightLabel" : "<string>", // ICopyright holder and year(s)
    "type" : "<code>", // Iperson | animal | practitioner | device | careteam | healthcareservice | location | organization | relatedperson | specimen
    "membership" : "definitional", // I R! 
    "code" : { CodeableConcept }, // IUse of the Group (and by implication, kind of members)
    "quantity" : "<unsignedInt>", // INumber of members
    "managingEntity" : { Reference(Organization) }, // IEntity that is the custodian of the Group's definition
    "combinationMethod" : "<code>", // Iall-of | any-of | at-least | at-most | except-subset
    "combinationThreshold" : "<positiveInt>", // IProvides the value of "n" when "at-least" or "at-most" codes are used
    "characteristic" : [{ BackboneElement }], // I R! Include / Exclude group members by Trait
    "member" : [{ BackboneElement }] // IWho or what is in group
  }

Summary

Mandatory: 2 elements
Fixed Value: 1 element

This provides the consolidated view (aka snapshot) of the profile after applying the changes in this profile to the base Group structure.

Name	Flags	Card.	Type	Description & Constraints
Group	C	1..1	Group	Group of multiple entities cnl-2: Group.type SHALL be defined if Group.membership is either 'definitional' or 'enumerated'
id	Σ	0..1	id	Logical id of this artifact
meta	Σ	0..1	Meta	Metadata about the resource
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
language		0..1	code	Language of the resource content Binding: All Languages (required): IETF language tag for a human language Additional Bindings Purpose Common Languages Starter Set
text		0..1	Narrative	Text summary of the resource, for human interpretation
contained		0..*	Resource	Contained, inline Resources
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored
url	ΣC	0..1	uri	Canonical identifier for this Group, represented as an absolute URI (globally unique) cnl-1: URL should not contain | or # - these characters make processing canonical references problematic
identifier	Σ	0..*	Identifier	Business Identifier for this Group
version	Σ	0..1	string	Business version of the Group
versionAlgorithm[x]	Σ	0..1		How to compare versions Binding: Version Algorithm (extensible)
versionAlgorithmString			string
versionAlgorithmCoding			Coding
name	Σ	0..1	string	Label for Group
title	Σ	0..1	string	Name for this Group (human friendly)
status	?!Σ	0..1	code	draft | active | retired | unknown Binding: PublicationStatus (required): The lifecycle status of an artifact.
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/steward (organization or individual)
contact	Σ	0..*	ContactDetail	Contact details for the publisher
description		0..1	markdown	Natural language description of the group
useContext	Σ	0..*	UsageContext	The context that the content is intended to support
purpose		0..1	markdown	Why this Group is defined
copyright		0..1	markdown	Use and/or publishing restrictions
copyrightLabel		0..1	string	Copyright holder and year(s)
type	Σ	0..1	code	person | animal | practitioner | device | careteam | healthcareservice | location | organization | relatedperson | specimen Binding: Group Type (required): Types of resources that are part of group.
membership	Σ	1..1	code	definitional | conceptual | enumerated Binding: Group Membership Basis (required): The basis for membership in a group Fixed Value: definitional
code	Σ	0..1	CodeableConcept	Use of the Group (and by implication, kind of members) Binding: Group Code (extensible): A code that describes the kind of group, which usually dictates what kind if entities can be in the group.
quantity	Σ	0..1	unsignedInt	Number of members
managingEntity	Σ	0..1	Reference(Organization | RelatedPerson | Practitioner | PractitionerRole)	Entity that is the custodian of the Group's definition
combinationMethod	?!Σ	0..1	code	all-of | any-of | at-least | at-most | except-subset Binding: Group Characteristic Combination (required)
combinationThreshold		0..1	positiveInt	Provides the value of "n" when "at-least" or "at-most" codes are used
characteristic	Σ	1..*	BackboneElement	Include / Exclude group members by Trait
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code	Σ	1..1	CodeableConcept	Kind of characteristic Binding Description (No ValueSet): (example): List of characteristics used to describe group members; e.g. gender, age, owner, location, etc.
value[x]	Σ	1..1		Value held by characteristic Binding Description (No ValueSet): (example): Value of descriptive member characteristic; e.g. red, male, pneumonia, Caucasian, etc.
valueCodeableConcept			CodeableConcept
valueBoolean			boolean
valueQuantity			Quantity
valueRange			Range
valueReference			Reference(Any)
valueUri			uri
valueExpression			Expression
exclude	Σ	1..1	boolean	Group includes or excludes
description		0..1	markdown	Natural language description of the characteristic
method		0..*	CodeableConcept	Method for how the characteristic value was determined Binding: Definition Method (example)
determinedBy[x]		0..1		Defines the characteristic
determinedByReference			Reference(Device | DeviceDefinition | DeviceMetric)
determinedByExpression			Expression
offset	?!Σ	0..1	CodeableConcept	Reference point for comparison Binding: Characteristic Offset (example)
instances[x]		0..1		Number of occurrences meeting the characteristic
instancesQuantity			Quantity
instancesRange			Range
duration[x]		0..1		Length of time in which the characteristic is met
durationDuration			Duration
durationRange			Range
period		0..1	Period	Period over which characteristic is tested
timing		0..*	RelativeTime	Timing in which the characteristic is determined
member		0..*	BackboneElement	Who or what is in group
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
entity		1..1	Reference(CareTeam | Device | Group | HealthcareService | Location | Organization | Patient | Practitioner | PractitionerRole | RelatedPerson | Specimen)	Reference to the group member
involvement		0..*	CodeableConcept	Code that describes how user is part of the group Binding: Group Involvement (example): A code that describes how a user is involved in the group
period		0..1	Period	Period member belonged to the group
inactive		0..1	boolean	If member is no longer in group
Documentation for this format

<!-- GroupDefinition -->

<Group xmlns="http://hl7.org/fhir"
>
  <!-- from Element: extension -->
 <id value="[id]"/><!-- 0..1 Logical id of this artifact -->
 <meta><!-- I 0..1 Meta Metadata about the resource --></meta>
 <implicitRules value="[uri]"/><!-- I 0..1 A set of rules under which this content was created -->
 <language value="[code]"/><!-- I 0..1 Language of the resource content   -->
 <text><!-- I 0..1 Narrative Text summary of the resource, for human interpretation --></text>
 <contained><!-- 0..* Resource Contained, inline Resources --></contained>
 <modifierExtension><!-- I 0..* Extension  Extensions that cannot be ignored  --></modifierExtension>
 <url value="[uri]"/><!-- I 0..1 Canonical identifier for this Group, represented as an absolute URI (globally unique) -->
 <identifier><!-- I 0..* Identifier Business Identifier for this Group --></identifier>
 <version value="[string]"/><!-- I 0..1 Business version of the Group -->
 <versionAlgorithm[x]><!-- I 0..1 string|Coding How to compare versions   --></versionAlgorithm[x]>
 <name value="[string]"/><!-- I 0..1 Label for Group -->
 <title value="[string]"/><!-- I 0..1 Name for this Group (human friendly) -->
 <status value="[code]"/><!-- I 0..1 draft | active | retired | unknown   -->
 <experimental value="[boolean]"/><!-- I 0..1 For testing purposes, not real usage -->
 <date value="[dateTime]"/><!-- I 0..1 Date last changed -->
 <publisher value="[string]"/><!-- I 0..1 Name of the publisher/steward (organization or individual) -->
 <contact><!-- I 0..* ContactDetail Contact details for the publisher --></contact>
 <description value="[markdown]"/><!-- I 0..1 Natural language description of the group -->
 <useContext><!-- I 0..* UsageContext 
     The context that the content is intended to support --></useContext>
 <purpose value="[markdown]"/><!-- I 0..1 Why this Group is defined -->
 <copyright value="[markdown]"/><!-- I 0..1 Use and/or publishing restrictions -->
 <copyrightLabel value="[string]"/><!-- I 0..1 Copyright holder and year(s) -->
 <type value="[code]"/><!-- I 0..1 person | animal | practitioner | device | careteam | healthcareservice | location | organization | relatedperson | specimen   -->
 <membership value="[code]"/><!-- I 1..1 definitional | conceptual | enumerated   -->
 <code><!-- I 0..1 CodeableConcept Use of the Group (and by implication, kind of members)   --></code>
 <quantity value="[unsignedInt]"/><!-- I 0..1 Number of members -->
 <managingEntity><!-- I 0..1 Reference(Organization) 
     Entity that is the custodian of the Group's definition --></managingEntity>
 <combinationMethod value="[code]"/><!-- I 0..1 all-of | any-of | at-least | at-most | except-subset   -->
 <combinationThreshold value="[positiveInt]"/><!-- I 0..1 Provides the value of "n" when "at-least" or "at-most" codes are used -->
 <characteristic> I 1..* BackboneElement  <!-- I 1..* Include / Exclude group members by Trait -->
  <modifierExtension><!-- I 0..* Extension  Extensions that cannot be ignored even if unrecognized  --></modifierExtension>
  <code><!-- I 1..1 CodeableConcept 
      Kind of characteristic --></code>
  <value[x]><!-- I 1..1 CodeableConcept|boolean|Quantity|
    Range|Reference|uri|Expression Value held by characteristic --></value[x]>
  <exclude value="[boolean]"/><!-- I 1..1 Group includes or excludes -->
  <description value="[markdown]"/><!-- I 0..1 Natural language description of the characteristic -->
  <method><!-- I 0..* CodeableConcept Method for how the characteristic value was determined   --></method>
  <determinedBy[x]><!-- I 0..1 Reference(Device)|Expression 
      Defines the characteristic --></determinedBy[x]>
  <offset><!-- I 0..1 CodeableConcept Reference point for comparison   --></offset>
  <instances[x]><!-- I 0..1 Quantity|Range 
      Number of occurrences meeting the characteristic --></instances[x]>
  <duration[x]><!-- I 0..1 Duration|Range 
      Length of time in which the characteristic is met --></duration[x]>
  <period><!-- I 0..1 Period 
      Period over which characteristic is tested --></period>
  <timing><!-- I 0..* RelativeTime 
      Timing in which the characteristic is determined --></timing>
 </characteristic>
 <member> I 0..* BackboneElement  <!-- I 0..* Who or what is in group -->
  <modifierExtension><!-- I 0..* Extension  Extensions that cannot be ignored even if unrecognized  --></modifierExtension>
  <entity><!-- I 1..1 Reference(CareTeam) Reference to the group member --></entity>
  <involvement><!-- I 0..* CodeableConcept Code that describes how user is part of the group   --></involvement>
  <period><!-- I 0..1 Period Period member belonged to the group --></period>
  <inactive value="[boolean]"/><!-- I 0..1 If member is no longer in group -->
 </member>
</Group>

{ // GroupDefinition
  // from Element: extension
    "meta" : { Meta }, // IMetadata about the resource
    "implicitRules" : "<uri>", // IA set of rules under which this content was created
    "language" : "<code>", // ILanguage of the resource content
    "text" : { Narrative }, // IText summary of the resource, for human interpretation
    "contained" : [{ Resource }], //Contained, inline Resources
    "modifierExtension" : [{ Extension }], // IExtensions that cannot be ignored
    "url" : "<uri>", // ICanonical identifier for this Group, represented as an absolute URI (globally unique)
    "identifier" : [{ Identifier }], // IBusiness Identifier for this Group
    "version" : "<string>", // IBusiness version of the Group
  // value[x]: How to compare versions. One of these 2:
    "versionAlgorithmString" : "<string>", // IHow to compare versions
    "versionAlgorithmCoding" : { Coding }, // IHow to compare versions
    "name" : "<string>", // ILabel for Group
    "title" : "<string>", // IName for this Group (human friendly)
    "status" : "<code>", // Idraft | active | retired | unknown
    "experimental" : <boolean>, // IFor testing purposes, not real usage
    "date" : "<dateTime>", // IDate last changed
    "publisher" : "<string>", // IName of the publisher/steward (organization or individual)
    "contact" : [{ ContactDetail }], // IContact details for the publisher
    "description" : "<markdown>", // INatural language description of the group
    "useContext" : [{ UsageContext }], // IThe context that the content is intended to support
    "purpose" : "<markdown>", // IWhy this Group is defined
    "copyright" : "<markdown>", // IUse and/or publishing restrictions
    "copyrightLabel" : "<string>", // ICopyright holder and year(s)
    "type" : "<code>", // Iperson | animal | practitioner | device | careteam | healthcareservice | location | organization | relatedperson | specimen
    "membership" : "definitional", // I R! 
    "code" : { CodeableConcept }, // IUse of the Group (and by implication, kind of members)
    "quantity" : "<unsignedInt>", // INumber of members
    "managingEntity" : { Reference(Organization) }, // IEntity that is the custodian of the Group's definition
    "combinationMethod" : "<code>", // Iall-of | any-of | at-least | at-most | except-subset
    "combinationThreshold" : "<positiveInt>", // IProvides the value of "n" when "at-least" or "at-most" codes are used
    "characteristic" : [{ BackboneElement }], // I R! Include / Exclude group members by Trait
    "member" : [{ BackboneElement }] // IWho or what is in group
  }