# description
A structured set of questions intended to guide the collection of answers from end-users. Questionnaires provide detailed control over order, presentation, phraseology and grouping to allow coherent, consistent data collection.

# snapshot.element[].definition
A structured set of questions intended to guide the collection of answers from end-users. Questionnaires provide detailed control over order, presentation, phraseology and grouping to allow coherent, consistent data collection.

# snapshot.element[].constraint[].human
If the resource is contained in another resource, it SHALL NOT contain nested Resources

# snapshot.element[].constraint[].human
If the resource is contained in another resource, it SHALL NOT contain any narrative

# snapshot.element[].constraint[].human
If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated

# snapshot.element[].constraint[].human
If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource

# snapshot.element[].constraint[].human
The link ids for groups and questions must be unique within the questionnaire

# snapshot.element[].definition
The logical id of the resource, as used in the URL for the resource. Once assigned, this value never changes.

# snapshot.element[].comment
The only time that a resource does not have an id is when it is being submitted to the server using a create operation.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].definition
The metadata about the resource. This is content that is maintained by the infrastructure. Changes to the content may not always be associated with version changes to the resource.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].short
A set of rules under which this content was created

# snapshot.element[].definition
A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content.

# snapshot.element[].comment
Asserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element.   This element is labelled as a modifier because the implicit rules may provide additional knowledge about the resource that modifies it's meaning or interpretation.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].definition
The base language in which the resource is written.

# snapshot.element[].comment
Language is provided to support indexing and accessibility (typically, services such as text to speech use the language tag). The html language tag in the narrative applies  to the narrative. The language tag on the resource may be used to specify the language of other presentations generated from the data in the resource  Not all the content has to be in the base language. The Resource.language should not be assumed to apply to the narrative automatically. If a language is specified, it should it also be specified on the div element in the html (see rules in HTML5 for information about the relationship between xml:lang and the html lang attribute).

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].short
Text summary of the resource, for human interpretation

# snapshot.element[].definition
A human-readable narrative that contains a summary of the resource, and may be used to represent the content of the resource to a human. The narrative need not encode all the structured data, but is required to contain sufficient detail to make it "clinically safe" for a human to just read the narrative. Resource definitions may define what content should be represented in the narrative to ensure clinical safety.

# snapshot.element[].comment
Contained resources do not have narrative. Resources that are not contained SHOULD have a narrative. In some cases, a resource may only have text with little or no additional discrete data (as long as all minOccurs=1 elements are satisfied).  This may be necessary for data from legacy systems where information is captured as a "text blob" or where text is additionally entered raw or narrated and encoded in formation is added later.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].definition
These resources do not have an independent existence apart from the resource that contains them - they cannot be identified independently, and nor can they have their own independent transaction scope.

# snapshot.element[].comment
This should never be done when the content can be identified properly, as once identification is lost, it is extremely difficult (and context dependent) to restore it again.

# snapshot.element[].slicing.description
Extensions are always sliced by (at least) url

# snapshot.element[].short
Additional Content defined by implementations

# snapshot.element[].definition
May be used to represent additional information that is not part of the basic definition of the resource. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

# snapshot.element[].comment
There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].constraint[].human
Must have either extensions or value[x], not both

# snapshot.element[].slicing.description
Extensions are always sliced by (at least) url

# snapshot.element[].definition
May be used to represent additional information that is not part of the basic definition of the resource, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

# snapshot.element[].comment
There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].constraint[].human
Must have either extensions or value[x], not both

# snapshot.element[].short
Logical URI to reference this questionnaire (globally unique)

# snapshot.element[].definition
An absolute URI that is used to identify this questionnaire when it is referenced in a specification, model, design or an instance. This SHALL be a URL, SHOULD be globally unique, and SHOULD be an address at which this questionnaire is (or will be) published. The URL SHOULD include the major version of the questionnaire. For more information see [Technical and Business Versions](resource.html#versions).

# snapshot.element[].comment
Can be a urn:uuid: or a urn:oid:, but real http: addresses are preferred.  Multiple instances may share the same url if they have a distinct version.

# snapshot.element[].requirements
…  This is the id that will be used to link a QuestionnaireResponse to the Questionnaire the response is for.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].short
Additional identifier for the questionnaire

# snapshot.element[].definition
A formal identifier that is used to identify this questionnaire when it is represented in other formats, or referenced in a specification, model, design or an instance.

# snapshot.element[].comment
Typically, this is used for identifiers that can go in an HL7 V3 II (instance identifier) data type, e.g., to identify this questionnaire outside of FHIR, where it is not possible to use the logical URI.

# snapshot.element[].requirements
Allows externally provided and/or usable business identifiers to be easily associated with the module.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].mapping[].map
CX / EI (occasionally, more often EI maps to a resource id or a URL)

# snapshot.element[].mapping[].map
II - see see identifier pattern at http://wiki.hl7.org/index.php?title=Common_Design_Patterns#Identifier_Pattern for relevant discussion. The Identifier class is a little looser than the v3 type II because it allows URIs as well as registered OIDs or GUIDs.  Also maps to Role[classCode=IDENT]

# snapshot.element[].definition
The identifier that is used to identify this version of the questionnaire when it is referenced in a specification, model, design or instance. This is an arbitrary value managed by the questionnaire author and is not expected to be globally unique. For example, it might be a timestamp (e.g. yyyymmdd) if a managed version is not available. There is also no expectation that versions can be placed in a lexicographical sequence.

# snapshot.element[].comment
There may be different questionnaire instances that have the same identifier but different versions.  The version can be appended to the url in a reference to allow a refrence to a particular business version of the questionnaire with the format [url]|[version].

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].short
Name for this questionnaire (computer friendly)

# snapshot.element[].definition
A natural language name identifying the questionnaire. This name should be usable as an identifier for the module by machine processing applications such as code generation.

# snapshot.element[].comment
The name is not expected to be globally unique. The name should be a simple alpha-numeric type name to ensure that it is computable friendly.

# snapshot.element[].requirements
Support human navigation and code generation.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].short
Name for this questionnaire (human friendly)

# snapshot.element[].definition
A short, descriptive, user-friendly title for the questionnaire.

# snapshot.element[].comment
This name does not need to be machine-processing friendly and may contain punctuation, white-space, etc.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].definition
The status of this questionnaire. Enables tracking the life-cycle of the content.

# snapshot.element[].comment
Allows filtering of questionnaires that are appropriate for use vs. not.   This is labeled as "Is Modifier" because applications should not use a retired questionnaire without due consideration.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].binding.description
The lifecycle status of a Value Set or Concept Map.

# snapshot.element[].definition
A boolean value to indicate that this questionnaire is authored for testing purposes (or education/evaluation/marketing), and is not intended to be used for genuine usage.

# snapshot.element[].comment
Allows filtering of questionnaire that are appropriate for use vs. not. This is labeled as "Is Modifier" because applications should not use an experimental questionnaire in production.

# snapshot.element[].requirements
Enables experimental content to be developed following the same lifecycle that would be used for a production-level questionnaire.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].definition
The date  (and optionally time) when the questionnaire was published. The date must change if and when the business version changes and it must change if the status code changes. In addition, it should change when the substantive content of the questionnaire changes.

# snapshot.element[].comment
Note that this is not the same as the resource last-modified-date, since the resource may be a secondary representation of the questionnaire. Additional specific dates may be added as extensions or be found by consulting Provenances associated with past versions of the resource.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].short
Name of the publisher (organization or individual)

# snapshot.element[].definition
The name of the individual or organization that published the questionnaire.

# snapshot.element[].comment
Usually an organization, but may be an individual. The publisher (or steward) of the questionnaire is the organization or individual primarily responsible for the maintenance and upkeep of the questionnaire. This is not necessarily the same individual or organization that developed and initially authored the content. The publisher is the primary point of contact for questions or issues with the questionnaire. This item SHOULD be populated unless the information is available from context.

# snapshot.element[].requirements
Helps establish the "authority/credibility" of the questionnaire.  May also allow for contact.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].short
Natural language description of the questionnaire

# snapshot.element[].definition
A free text natural language description of the questionnaire from a consumer's perspective.

# snapshot.element[].comment
This description can be used to capture details such as why the questionnaire was built, comments about misuse, instructions for clinical use and interpretation, literature references, examples from the paper world, etc. It is not a rendering of the questionnaire as conveyed in the 'text' field of the resource itself. This item SHOULD be populated unless the information is available from context (e.g. the language of the profile is presumed to be the predominant language in the place the profile was created).

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].definition
Explaination of why this questionnaire is needed and why it has been designed as it has.

# snapshot.element[].comment
This element does not describe the usage of the questionnaire Instead  it provides traceability of ''why'' the resource is either needed or ''why'' it is defined as it is.  This may be used to point to source materials or specifications that drove the structure of this questionnaire.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].short
When the questionnaire was approved by publisher

# snapshot.element[].definition
The date on which the resource content was approved by the publisher. Approval happens once when the content is officially approved for usage.

# snapshot.element[].comment
The 'date' element may be more recent than the approval date because of minor changes / editorial corrections.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].short
When the questionnaire was last reviewed

# snapshot.element[].definition
The date on which the resource content was last reviewed. Review happens periodically after approval, but doesn't change the original approval date.

# snapshot.element[].comment
If specified, this is usually after the approval date.

# snapshot.element[].requirements
Gives a sense of how "current" the content is.  Resources that have not been reviewed in a long time may have a risk of being less appropriate/relevant.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].short
When the questionnaire is expected to be used

# snapshot.element[].definition
The period during which the questionnaire content was or is planned to be in active use.

# snapshot.element[].comment
The effective period for a questionnaire  determines when the content is applicable for usage and is independent of publication and review dates. For example, a measure intended to be used for the year 2016 might be published in 2015.

# snapshot.element[].requirements
Allows establishing a transition before a resource comes into effect and also allows for a sunsetting  process when new versions of a the questionnaire are or are expected to be used instead.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].constraint[].human
If present, start SHALL have a lower value than end

# snapshot.element[].constraint[].expression
start.empty() or end.empty() or (start <= end)

# snapshot.element[].mapping[].map
IVL<TS>[lowClosed="true" and highClosed="true"] or URG<TS>[lowClosed="true" and highClosed="true"]

# snapshot.element[].short
Context the content is intended to support

# snapshot.element[].definition
The content was developed with a focus and intent of supporting the contexts that are listed. These terms may be used to assist with indexing and searching for appropriate questionnaire instances.

# snapshot.element[].comment
When multiple useContexts are specified, there is no expectation whether all or any of the contexts apply.

# snapshot.element[].requirements
Assist in searching for appropriate content.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].short
Intended jurisdiction for questionnaire (if applicable)

# snapshot.element[].definition
A legal or geographic region in which the questionnaire is intended to be used.

# snapshot.element[].comment
It may be possible for the questionnaire to be used in jurisdictions other than those for which it was originally designed or intended.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].binding.description
Countries and regions within which this artifact is targeted for use

# snapshot.element[].definition
Contact details to assist a user in finding and communicating with the publisher.

# snapshot.element[].comment
May be a web site, an email address, a telephone number, etc.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].definition
A copyright statement relating to the questionnaire and/or its contents. Copyright statements are generally legal restrictions on the use and publishing of the questionnaire.

# snapshot.element[].comment
Systems are not required to have markdown support, and there is considerable variation in markdown syntax, so the text should be readable without markdown processing. The preferred markdown syntax is described here: http://daringfireball.net/projects/markdown/syntax (and tests here: http://daringfireball.net/projects/downloads/MarkdownTest_1.0.zip)

# snapshot.element[].requirements
Consumers must be able to determine any legal restrictions on the use of the questionnaire and/or its content.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].short
Concept that represents the overall questionnaire

# snapshot.element[].definition
An identifier for this question or group of questions in a particular terminology such as LOINC.

# snapshot.element[].comment
Codes may be defined very casually in enumerations or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information.

# snapshot.element[].requirements
Allows linking of the complete Questionnaire resources to formal terminologies.  It's common for "panels" of questions to be identified by a code.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].binding.description
Codes for questionnaires, groups and individual questions

# snapshot.element[].mapping[].map
CE/CNE/CWE subset one of the sets of component 1-3 or 4-6

# snapshot.element[].short
Resource that can be subject of QuestionnaireResponse

# snapshot.element[].definition
The types of subjects that can be the subject of responses created for the questionnaire.

# snapshot.element[].comment
If none are specified, then the subject is unlimited.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].binding.description
One of the resource types defined as part of FHIR.

# snapshot.element[].short
Questions and sections within the Questionnaire

# snapshot.element[].definition
A particular question, question grouping or display text that is part of the questionnaire.

# snapshot.element[].comment
The content of the questionnaire is constructed from an ordered, hierarchical collection of items.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].constraint[].human
Read-only can't be specified for "display" items

# snapshot.element[].constraint[].human
Default values can't be specified for groups or display items

# snapshot.element[].constraint[].human
Required and repeat aren't permitted for display items

# snapshot.element[].constraint[].expression
(type ='choice' or type = 'open-choice') or (options.empty() and option.empty())

# snapshot.element[].constraint[].human
A question cannot have both option and options

# snapshot.element[].constraint[].human
Display items cannot have a "code" asserted

# snapshot.element[].constraint[].human
Maximum length can only be declared for simple question types

# snapshot.element[].constraint[].expression
(type in ('boolean' | 'decimal' | 'integer' | 'string' | 'text' | 'url')) or maxLength.empty()

# snapshot.element[].constraint[].human
Group items must have nested items, display items cannot have nested items

# snapshot.element[].definition
unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

# snapshot.element[].comment
Note that FHIR strings may not exceed 1MB in size

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].slicing.description
Extensions are always sliced by (at least) url

# snapshot.element[].short
Additional Content defined by implementations

# snapshot.element[].definition
May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

# snapshot.element[].comment
There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].constraint[].human
Must have either extensions or value[x], not both

# snapshot.element[].definition
May be used to represent additional information that is not part of the basic definition of the element, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

# snapshot.element[].comment
There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].constraint[].human
Must have either extensions or value[x], not both

# snapshot.element[].definition
An identifier that is unique within the Questionnaire allowing linkage to the equivalent item in a QuestionnaireResponse resource.

# snapshot.element[].comment
This ''can'' be a meaningful identifier (e.g. a LOINC code) but is not intended to have any meaning.  GUIDs or sequential numbers are appropriate here.

# snapshot.element[].requirements
[QuestionnaireResponse](questionnaireresponse.html#) does not require omitted items to be included and may have some items that repeat, so linkage based on position alone is not sufficient.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].short
ElementDefinition - details for the item

# snapshot.element[].definition
A reference to an [ElementDefinition](elementdefinition.html) that provides the details for the item. If a definition is provided, then the following element values can be inferred from the definition:   * code (ElementDefinition.code) * type (ElementDefinition.type) * required (ElementDefinition.min) * repeats (ElementDefinition.max) * maxLength (ElementDefinition.maxLength) * options (ElementDefinition.binding)  Any information provided in these elements on a Questionnaire Item overrides the information from the definition.

# snapshot.element[].comment
the URI refers to an ElementDefinition in either a [StructureDefinition](structuredefinition.html#) or a [DataElement](dataelement.html#), and always starts with the canonical URL for the target resource. When referring to a StructureDefinition, a fragment identifier is used to specify the element definition by its id [Element.id](element-definitions.html#Element.id). E.g. http://hl7.org/fhir/StructureDefinition/Observation#Observation.value[x]. In the absence of a fragment identifier, the first/root element definition in the target is the matching element definition. Note that [LOINC codes](loinc.html#dataelements) implicitly define DataElement resources.

# snapshot.element[].requirements
A common pattern is to define a set of data elements and then build multiple questionnaires for different circumstances to gather the data. This element provides traceability to the common definition and allows the content for the question to come from the underlying definition.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].short
Corresponding concept for this item in a terminology

# snapshot.element[].definition
A terminology code that corresponds to this group or question (e.g. a code from LOINC, which defines many questions and answers).

# snapshot.element[].comment
The value may come from the ElementDefinition referred to by .definition.

# snapshot.element[].requirements
Allows linking of groups of questions to formal terminologies.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].binding.description
Codes for questionnaires, groups and individual questions

# snapshot.element[].mapping[].map
CE/CNE/CWE subset one of the sets of component 1-3 or 4-6

# snapshot.element[].definition
A short label for a particular group, question or set of display text within the questionnaire used for reference by the individual completing the questionnaire.

# snapshot.element[].comment
These are generally unique within a questionnaire, though this is not guaranteed. Some questionnaires may have multiple questions with the same label with logic to control which gets exposed.  Typically these won't be used for "display" items, though such use is not prohibited.  Systems SHOULD NOT generate their own prefixes if prefixes are defined for any items within a Questionnaire.

# snapshot.element[].requirements
Separating the label from the question text allows improved rendering.  Also, instructions will often refer to specific prefixes, so there's a need for the questionnaire design to have control over what labels are used.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].definition
The name of a section, the text of a question or text content for a display item.

# snapshot.element[].comment
Note that FHIR strings may not exceed 1MB in size

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].short
group | display | boolean | decimal | integer | date | dateTime +

# snapshot.element[].definition
The type of questionnaire item this is - whether text for display, a grouping of other items or a particular type of data to be captured (string, integer, coded choice, etc.).

# snapshot.element[].comment
Additional constraints on the type of answer can be conveyed by extensions. The value may come from the ElementDefinition referred to by .definition.

# snapshot.element[].requirements
Defines the format in which the user is to be prompted for the answer.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].binding.description
Distinguishes groups from questions and display text and indicates data type for questions

# snapshot.element[].definition
A constraint indicating that this item should only be enabled (displayed/allow answers to be captured) when the specified condition is true.

# snapshot.element[].comment
If multiple repetitions of this extension are present, the item should be enabled when the condition for *any* of the repetitions is true.  I.e. treat "enableWhen"s as being joined by an "or" clause.  This element is a modifier because if enableWhen is present for an item, "required" is ignored unless one of the enableWhen conditions is met.

# snapshot.element[].requirements
Allows questionnaires to adapt based on answers to other questions. E.g. If physical gender is specified as a male, no need to capture pregnancy history.  Also allows conditional display of instructions or groups of questions.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].constraint[].human
enableWhen must contain either a 'answer' or a 'hasAnswer' element

# snapshot.element[].definition
unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

# snapshot.element[].comment
Note that FHIR strings may not exceed 1MB in size

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].slicing.description
Extensions are always sliced by (at least) url

# snapshot.element[].short
Additional Content defined by implementations

# snapshot.element[].definition
May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

# snapshot.element[].comment
There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].constraint[].human
Must have either extensions or value[x], not both

# snapshot.element[].definition
May be used to represent additional information that is not part of the basic definition of the element, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

# snapshot.element[].comment
There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].constraint[].human
Must have either extensions or value[x], not both

# snapshot.element[].short
Question that determines whether item is enabled

# snapshot.element[].definition
The linkId for the question whose answer (or lack of answer) governs whether this item is enabled.

# snapshot.element[].comment
If multiple question occurrences are present for the same question (same linkId), then this refers to the nearest question occurrence reachable by tracing first the "ancestor" axis and then the "preceding" axis and then the "following" axis.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].definition
An indication that this item should be enabled only if the specified question is answered (hasAnswer=true) or not answered (hasAnswer=false).

# snapshot.element[].comment
If answered=false and answer values are also provided, then they are treated as "or".  I.e. "Enable if the question is unanswered or the answer is one of the specified values".  If answered=true and answers are present, one of the specified answers must be met. (So there's little reason to specify answered=true if answers are present.).

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].definition
An answer that the referenced question must match in order for the item to be enabled.

# snapshot.element[].comment
Multiple answers are treated as "or".  E.g. Enable if question 1 = A, C or E.    Components not specified in the answer do not need to match.  For example, if enableWhen specifies code + system for a Coding, it is ok if the answer has a "display" element.  I.e. treat the answer as a 'pattern'.  The dataType of this element must be the same as the data type of the question being referenced.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].short
Whether the item must be included in data results

# snapshot.element[].definition
An indication, if true, that the item must be present in a "completed" QuestionnaireResponse.  If false, the item may be skipped when answering the questionnaire.

# snapshot.element[].comment
Questionnaire.item.required only has meaning for elements that are conditionally enabled with enableWhen if the condition evaluates to true.  If an item that contains other items is marked as required, that does not automatically make the contained elements required (though required groups must contain at least one child element). The value may come from the ElementDefinition referred to by .definition.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].definition
An indication, if true, that the item may occur multiple times in the response, collecting multiple answers answers for questions or multiple sets of answers for groups.

# snapshot.element[].comment
If a question is marked as repeats=true, then multiple answers can be provided for the question in the corresponding QuestionnaireResponse.  When rendering the questionnaire, it is up to the rendering software whether to render the question text for each answer repetition or to simply list each of the answers beneath the question.  (Which is most appropriate visually may depend on the type of answer as well as whether there are nested items.). The value may come from the ElementDefinition referred to by .definition.

# snapshot.element[].requirements
Items may be used to create set of (related) questions that can be repeated to give multiple answers to such a set.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].definition
An indication, when true, that the value cannot be changed by a human respondent to the Questionnaire.

# snapshot.element[].comment
The value of readOnly elements can be established by asserting  extensions for defaultValues, linkages that support pre-population and/or extensions that support calculation based on other answers.

# snapshot.element[].requirements
Allows certain information to be phrased (and rendered) as a question and an answer, while keeping users from changing it.  May also be useful for preventing changes to pre-populated portions of a questionnaire, for calculated values, etc.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].definition
The maximum number of characters that are permitted in the answer to be considered a "valid" QuestionnaireResponse.

# snapshot.element[].comment
For base64binary, reflects the number of characters representing the encoded data, not the number of bytes of the binary data. The value may come from the ElementDefinition referred to by .definition.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].definition
A reference to a value set containing a list of codes representing permitted answers for a "choice" or "open-choice" question.

# snapshot.element[].comment
LOINC defines many useful value sets for questionnaire responses. See [LOINC Answer Lists](loinc.html#alist). The value may come from the ElementDefinition referred to by .definition.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].constraint[].human
SHALL have a contained resource if a local reference is provided

# snapshot.element[].mapping[].map
The target of a resource reference is a RIM entry point (Act, Role, or Entity)

# snapshot.element[].definition
One of the permitted answers for a "choice" or "open-choice" question.

# snapshot.element[].comment
This element can be used when the value set machinery of options is deemed too cumbersome or when there's a need to capture options that are not codes.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].definition
unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

# snapshot.element[].comment
Note that FHIR strings may not exceed 1MB in size

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].slicing.description
Extensions are always sliced by (at least) url

# snapshot.element[].short
Additional Content defined by implementations

# snapshot.element[].definition
May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

# snapshot.element[].comment
There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].constraint[].human
Must have either extensions or value[x], not both

# snapshot.element[].definition
May be used to represent additional information that is not part of the basic definition of the element, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

# snapshot.element[].comment
There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].constraint[].human
Must have either extensions or value[x], not both

# snapshot.element[].definition
A potential answer that's allowed as the answer to this question.

# snapshot.element[].comment
The data type of the value must agree with the item.type.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].short
Default value when item is first rendered

# snapshot.element[].definition
The value that should be defaulted when initially rendering the questionnaire for user input.

# snapshot.element[].comment
The user is allowed to change the value and override the default (unless marked as read-only). If the user doesn't change the value, then this initial value will be persisted when the QuestionnaireResponse is initially created.  Note that default values can influence results.  The data type of initial[x] must agree with the item.type.

# snapshot.element[].requirements
In some workflows, having defaults saves time.

# snapshot.element[].constraint[].human
All FHIR elements must have a @value or children

# snapshot.element[].constraint[].expression
hasValue() | (children().count() > id.count())

# snapshot.element[].definition
Text, questions and other groups to be nested beneath a question or group.

# snapshot.element[].comment
There is no specified limit to the depth of nesting.  However, Questionnaire authors are encouraged to consider the impact on the user and user interface of overly deep nesting.

# snapshot.element[].requirements
Reports can consist of complex nested groups.