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StructureDefinition: ehealth-definedquestion

Introduction

The ehealth-definedquestion profile of StructureDefinition represents the concept of a DefinedQuestion. A DefinedQuestion is a standalone representation of a question and possibly its answer options that can be used in one or more Questionnaire resources. Although a Questionnaire can be constructed without being based on any DefinedQuestion, it is expected that a catalogue of DefinedQuestion will emerge over time and the particular DefinedQuestion will be reused in multiple Questionnaire.

The DefinedQuestion concept is based on ideas described in https://www.hl7.org/fhir/stu3/questionnaire.html#2.38.5.4. Whether a DefinedQuestion is referenced in a Questionnaire or not, it is the Questionnaire’s own definition which takes precedence.

Scope and Usage

In the eHealth Infrastructure, a reference to a DefinedQuestion by url in a Questionnaire question is used to enable robust extraction in automated processing rule(s) of answer(s) to that question from corresponding QuestionnaireResponse. An answer in a QuestionnaireResponse is already unambiguously related to a question in a Questionnaire through the question’s linkId. If the same question is used in another Questionnaire it will likely end up with a different linkId in that Questionnaire. By referencing a DefinedQuestion by its url in Questionnaire.item.definition, the same question can be referenced unambiguously in multiple Questionnaire.

Multiple DefinedQuestion with identical url can coexist as long as they have differing business versions in version. This way, different versions of the same question can have different answer options.

When using a DefinedQuestion in a Questionnaire, the Questionnaire.item.definition element must contain the url followed by a pipe and the business version thereby referencing a versioned DefinedQuestion.

An automated processing rule captured in a Library resource can, when extracting answer(s) to the question in a QuestionnaireResponse, choose to search for either the versioned reference or the version-less reference to a DefinedQuestion. The latter can be obtained by disregarding the pipe and business version in the rule logic.

The actual details of the DefinedQuestion’s question and possible answers are described in the ElementDefinition found in either snapshot.element or differential.element.

Formal Views of Profile Content

The official URL for this profile is:

http://ehealth.sundhed.dk/fhir/StructureDefinition/ehealth-definedquestion

This profile builds on StructureDefinition.

This profile was published on Thu Jan 07 13:26:31 UTC 2021 as a draft by null.

Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work.

 

Terminology Bindings

Path	Conformance	ValueSet
StructureDefinition.language	extensible	Common Languages Max Binding: All Languages
StructureDefinition.status	required	PublicationStatus
StructureDefinition.jurisdiction	extensible	Jurisdiction ValueSet
StructureDefinition.keyword	example	Structure Definition Codes
StructureDefinition.kind	required	StructureDefinitionKind
StructureDefinition.contextType	required	ExtensionContext
StructureDefinition.type	extensible	FHIRDefinedType
StructureDefinition.derivation	required	TypeDerivationRule

Constraints

Id	Path	Details	Requirements
dom-2	StructureDefinition	If the resource is contained in another resource, it SHALL NOT contain nested Resources : contained.contained.empty()
dom-1	StructureDefinition	If the resource is contained in another resource, it SHALL NOT contain any narrative : contained.text.empty()
dom-4	StructureDefinition	If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated : contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()
dom-3	StructureDefinition	If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource : contained.where(('#'+id in %resource.descendants().reference).not()).empty()
sdf-9	StructureDefinition	In any snapshot or differential, no label, code or requirements on the an element without a "." in the path (e.g. the first element) : children().element.where(path.contains('.').not()).label.empty() and children().element.where(path.contains('.').not()).code.empty() and children().element.where(path.contains('.').not()).requirements.empty()	Because these 3 fields seem to be have overlapping meaning with the ones in the root of StructureDefinition
sdf-19	StructureDefinition	Custom types can only be used in logical models : kind = 'logical' or (differential.element.type.code.all(hasValue() implies matches('^[a-zA-Z0-9]+$')) and snapshot.element.type.code.all(hasValue() implies matches('^[a-zA-Z0-9]+$')))	custom types only in logical models
sdf-16	StructureDefinition	All element definitions must have unique ids (snapshot) : snapshot.element.id.trace('ids').isDistinct()	element ids need to be unique
sdf-18	StructureDefinition	Context Invariants can only be used for extensions : contextInvariant.exists() implies type = 'Extension'	contextInvariant
sdf-17	StructureDefinition	All element definitions must have unique ids (diff) : differential.element.id.trace('ids').isDistinct()	element ids need to be unique
sdf-11	StructureDefinition	If there's a type, its content must match the path name in the first element of a snapshot : snapshot.empty() or snapshot.element.first().path = type	Ensure that the type is not inconsistent with the other information in the structure
sdf-14	StructureDefinition	All element definitions must have an id : snapshot.element.all(id.exists()) and differential.element.all(id.exists())	elements have id
sdf-1	StructureDefinition	Element paths must be unique unless the structure is a constraint : derivation = 'constraint' or snapshot.element.select(path).isDistinct()
sdf-7	StructureDefinition	If the structure describes a base Resource or Type, the URL has to start with "http://hl7.org/fhir/StructureDefinition/" and the tail must match the id : (derivation = 'constraint') or (kind = 'logical') or (url = 'http://hl7.org/fhir/StructureDefinition/'+id)
sdf-6	StructureDefinition	A structure must have either a differential, or a snapshot (or both) : snapshot.exists() or differential.exists()
sdf-5	StructureDefinition	If the structure defines an extension then the structure must have context information : type != 'Extension' or derivation = 'specialization' or (context.exists() and contextType.exists())
sdf-4	StructureDefinition	If the structure is not abstract, then there SHALL be a baseDefinition : abstract = true or baseDefinition.exists()	Ensure that the base types are abstract
ele-1	StructureDefinition.mapping	All FHIR elements must have a @value or children : hasValue() | (children().count() > id.count())
sdf-2	StructureDefinition.mapping	Must have at least a name or a uri (or both) : name.exists() or uri.exists()
ele-1	StructureDefinition.snapshot	All FHIR elements must have a @value or children : hasValue() | (children().count() > id.count())
sdf-15	StructureDefinition.snapshot	The first element in a snapshot has no type : kind!='logical' implies snapshot.element.first().type.empty()	No Type on the root element (snapshot)
sdf-8	StructureDefinition.snapshot	In any snapshot, all the elements must be in the specified type : (%resource.kind = 'logical' or element.first().path = %resource.type) and element.tail().all(path.startsWith(%resource.snapshot.element.first().path&'.'))
sdf-3	StructureDefinition.snapshot	Each element definition in a snapshot must have a formal definition and cardinalities : element.all(definition and min and max)
ele-1	StructureDefinition.differential	All FHIR elements must have a @value or children : hasValue() | (children().count() > id.count())
sdf-15a	StructureDefinition.differential	If the first element in a differential has no "." in the path, it has no type : element.first().path.contains('.').not() implies element.first().type.empty()	No Type on the root element (differential)
sdf-20	StructureDefinition.differential	No slicing on the root element : element.where(path.contains('.').not()).slicing.empty()	no slicing on root
sdf-8a	StructureDefinition.differential	In any differential, all the elements must be in the specified type : element.first().path.startsWith(%resource.type) and element.tail().all(path.startsWith(%resource.type&'.'))

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