Extension: Item Weight

FHIR Infrastructure Work Group

Maturity Level: 1

Trial Use

Use Context: Any

Official URL: `http://hl7.org/fhir/StructureDefinition/itemWeight`				Version: 5.0.0-snapshot3
draft as of 2013-12-05				Computable Name: ItemWeight
Flags: Non-Modifier				OID: TBD

Context of Use: Use on Element ID Coding, Element ID Questionnaire.item.answerOption, Element ID CodeSystem.concept, Element ID ValueSet.compose.include.concept or Element ID ValueSet.expansion.contains

Definition

A numeric value that allows the comparison (less than, greater than) or other numerical manipulation of a concept (e.g. Adding up components of a score). Scores are usually a whole number, but occasionally decimals are encountered in scores.

Comment:

Scores are commonly encountered in various clinical assessment scales. Assigning a value to a concept should generally be done in a formal code system that defines the value, or in an applicable value set for the concept, but some concepts do not have a formal definition (or are not even represented as a concept formally, especially in Questionnaires, so this extension is allowed to appear ouside those preferred contexts. Scores may even be assigned arbitrarily during use (hence, on Coding). The value may be constrained to an integer in some contexts of use. Todo: Scoring algorithms may also be defined directly, but how this is done is not yet defined

For questionnaires, see additional guidance and examples in the SDC implementation guide.

Summary

Name	Flags	Card.	Type	Description & Constraints
ItemWeight		0..1	decimal	URL = http://hl7.org/fhir/StructureDefinition/itemWeight ItemWeight: A numeric value that allows the comparison (less than, greater than) or other numerical manipulation of a concept (e.g. Adding up components of a score). Scores are usually a whole number, but occasionally decimals are encountered in scores. Use on Element ID Coding, Element ID Questionnaire.item.answerOption, Element ID CodeSystem.concept, Element ID ValueSet.compose.include.concept or Element ID ValueSet.expansion.contains
Documentation for this format

Full Structure

Name	Card.	Type	Description & Constraints
extension	0..1	Extension	URL = http://hl7.org/fhir/StructureDefinition/itemWeight ItemWeight: A numeric value that allows the comparison (less than, greater than) or other numerical manipulation of a concept (e.g. Adding up components of a score). Scores are usually a whole number, but occasionally decimals are encountered in scores. Use on Element ID Coding, Element ID Questionnaire.item.answerOption, Element ID CodeSystem.concept, Element ID ValueSet.compose.include.concept or Element ID ValueSet.expansion.contains
extension	0..0
url	1..1	uri	"http://hl7.org/fhir/StructureDefinition/itemWeight"
value[x]	1..1	decimal	Value of extension
Documentation for this format

XML Template

<!-- ItemWeight -->

<extension xmlns="http://hl7.org/fhir"
     url="http://hl7.org/fhir/StructureDefinition/itemWeight" >
  <!-- from Element: extension -->
 <valueDecimal value="[decimal]"/><!-- I 1..1 Value of extension -->
</extension>

JSON Template

{ // ItemWeight
  // from Element: extension
    "extension" : [ //  sliced by value:url  in the specified order, Open ]
  // extension: Extension: Prohibited
    "url" : "http://hl7.org/fhir/StructureDefinition/itemWeight", // R! 
    "valueDecimal" : <decimal> // I R! Value of extension
  }

Summary

Name	Flags	Card.	Type	Description & Constraints
ItemWeight		0..1	decimal	URL = http://hl7.org/fhir/StructureDefinition/itemWeight ItemWeight: A numeric value that allows the comparison (less than, greater than) or other numerical manipulation of a concept (e.g. Adding up components of a score). Scores are usually a whole number, but occasionally decimals are encountered in scores. Use on Element ID Coding, Element ID Questionnaire.item.answerOption, Element ID CodeSystem.concept, Element ID ValueSet.compose.include.concept or Element ID ValueSet.expansion.contains
Documentation for this format

Full Structure

Name	Card.	Type	Description & Constraints
extension	0..1	Extension	URL = http://hl7.org/fhir/StructureDefinition/itemWeight ItemWeight: A numeric value that allows the comparison (less than, greater than) or other numerical manipulation of a concept (e.g. Adding up components of a score). Scores are usually a whole number, but occasionally decimals are encountered in scores. Use on Element ID Coding, Element ID Questionnaire.item.answerOption, Element ID CodeSystem.concept, Element ID ValueSet.compose.include.concept or Element ID ValueSet.expansion.contains
extension	0..0
url	1..1	uri	"http://hl7.org/fhir/StructureDefinition/itemWeight"
value[x]	1..1	decimal	Value of extension
Documentation for this format

XML Template

<!-- ItemWeight -->

<extension xmlns="http://hl7.org/fhir"
     url="http://hl7.org/fhir/StructureDefinition/itemWeight" >
  <!-- from Element: extension -->
 <valueDecimal value="[decimal]"/><!-- I 1..1 Value of extension -->
</extension>

JSON Template

{ // ItemWeight
  // from Element: extension
    "extension" : [ //  sliced by value:url  in the specified order, Open ]
  // extension: Extension: Prohibited
    "url" : "http://hl7.org/fhir/StructureDefinition/itemWeight", // R! 
    "valueDecimal" : <decimal> // I R! Value of extension
  }

Constraints

ele-1: All FHIR elements must have a @value or children (xpath: hasValue() or (children().count() > id.count()))
ext-1: Must have either extensions or value[x], not both (xpath: extension.exists() != value.exists())
ele-1: On Extension.extension: All FHIR elements must have a @value or children (xpath on Extension.extension: hasValue() or (children().count() > id.count()))
ext-1: On Extension.extension: Must have either extensions or value[x], not both (xpath on Extension.extension: extension.exists() != value.exists())
ele-1: On Extension.value[x]: All FHIR elements must have a @value or children (xpath on Extension.value[x]: hasValue() or (children().count() > id.count()))

Search

No Search Extensions defined for this resource

Examples of this extension