This page is part of the Argonaut Questionnaire Implementation Guide (v1.0.0: Release) based on FHIR R3. This is the current published version. For a full list of available versions, see the Directory of published versions 
Definitions for the StructureDefinition-extension-itemOrder Profile.
| 1. Extension | |
| Definition | A non-negative integer representing the order of questions within Questionnaires groups, groups within groups and groups within questions and the order of answer choices for questions of type 'choice' and 'open-choice using |
| Control | 0..1 This element is affected by the following invariants: ele-1 |
| Comments | Note that a the order within an array SHALL be maintained in conformant FHIR implementation. However in practice, this can be difficult to validate and maintain. An explicit order element for Questionnaires item groups and answer choices helps the renderer to preserve the proper order. For example when the resource instance is split up and then reassembled from an application's internal format. When using a contained value set representing permitted answers for a 'choice' or 'open-choice' question use the standard FHIR extension valueset-conceptOrder to indicate the order rank in the same manner as with this extension |
| Invariants | Defined on this element ele-1: All FHIR elements must have a @value or children (: hasValue() | (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (: extension.exists() != value.exists()) |
| 2. Extension.id | |
| Definition | unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces. |
| Control | 0..1 |
| Type | string |
| 3. Extension.extension | |
| 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. |
| Control | 0..* |
| Type | Extension |
| Alternate Names | extensions, user content |
| Comments | 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. |
| 4. Extension.url | |
| Definition | Source of the definition for the extension code - a logical name or a URL. |
| Control | 1..1 |
| Type | uri |
| Comments | The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension. |
| Fixed Value | http://fhir.org/guides/argonaut/questionnaire/StructureDefinition/extension-itemOrder |
| 5. Extension.valueInteger | |
| Definition | Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list). |
| Control | 0..1 |
| Type | integer |
