Release 5 Preview #2

This page is part of the FHIR Specification (v4.4.0: R5 Preview #2). The current version which supercedes this version is 5.0.0. For a full list of available versions, see the Directory of published versions . Page versions: R4B R4 R3 R2

Extension: maxOccurs

FHIR Infrastructure Work Group

Maturity Level: 1

Informative

Use Context: Any

URL for this extension:

http://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs

Status: draft. Extension maintained by: HL7

The maximum number of times the group must appear, or the maximum number of answers for a question - when greater than 1 and not unlimited.

Comment:

Only relevant if the element has repeats=true and there's a need to constrain the number of allowed repetitions.

Context of Use: Use on Element ID Questionnaire.item or Element ID Questionnaire.item.item, with Context Invariant = type!='display' and (repeats=true or %extension.valueInteger=1)

Summary

Name	Flags	Card.	Type	Description & Constraints
maxOccurs		0..1	integer	URL = http://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs maxOccurs: The maximum number of times the group must appear, or the maximum number of answers for a question - when greater than 1 and not unlimited. Use on Element ID Questionnaire.item or Element ID Questionnaire.item.item, with <a href="structuredefinition-definitions.html#StructureDefinition.contextInvariant">Context Invariant</a> = <code>type!='display' and (repeats=true or %extension.valueInteger=1)</code>
Documentation for this format

Full Structure

Name	Flags	Card.	Type	Description & Constraints
extension		0..1	Extension	URL = http://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs maxOccurs: The maximum number of times the group must appear, or the maximum number of answers for a question - when greater than 1 and not unlimited. Use on Element ID Questionnaire.item or Element ID Questionnaire.item.item, with <a href="structuredefinition-definitions.html#StructureDefinition.contextInvariant">Context Invariant</a> = <code>type!='display' and (repeats=true or %extension.valueInteger=1)</code>
extension	I	0..0
url		1..1	uri	"http://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs"
value[x]	I	1..1	integer	Value of extension
Documentation for this format

XML Template

<!-- maxOccurs -->

<extension xmlns="http://hl7.org/fhir"
     url="http://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs" >
  <!-- from Element: extension -->
 <valueInteger value="[integer]"/><!--  1..1 Value of extension -->
</extension>

JSON Template

{ // maxOccurs
  // from Element: extension
    "extension" : [ //  sliced by value:url  in the specified order, Open ]
    "url" : "http://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs", // R! 
    "valueInteger" : <integer> // C? R! Value of extension
  }

Summary

Name	Flags	Card.	Type	Description & Constraints
maxOccurs		0..1	integer	URL = http://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs maxOccurs: The maximum number of times the group must appear, or the maximum number of answers for a question - when greater than 1 and not unlimited. Use on Element ID Questionnaire.item or Element ID Questionnaire.item.item, with <a href="structuredefinition-definitions.html#StructureDefinition.contextInvariant">Context Invariant</a> = <code>type!='display' and (repeats=true or %extension.valueInteger=1)</code>
Documentation for this format

Full Structure

Name	Flags	Card.	Type	Description & Constraints
extension		0..1	Extension	URL = http://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs maxOccurs: The maximum number of times the group must appear, or the maximum number of answers for a question - when greater than 1 and not unlimited. Use on Element ID Questionnaire.item or Element ID Questionnaire.item.item, with <a href="structuredefinition-definitions.html#StructureDefinition.contextInvariant">Context Invariant</a> = <code>type!='display' and (repeats=true or %extension.valueInteger=1)</code>
extension	I	0..0
url		1..1	uri	"http://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs"
value[x]	I	1..1	integer	Value of extension
Documentation for this format

XML Template

<!-- maxOccurs -->

<extension xmlns="http://hl7.org/fhir"
     url="http://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs" >
  <!-- from Element: extension -->
 <valueInteger value="[integer]"/><!--  1..1 Value of extension -->
</extension>

JSON Template

{ // maxOccurs
  // from Element: extension
    "extension" : [ //  sliced by value:url  in the specified order, Open ]
    "url" : "http://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs", // R! 
    "valueInteger" : <integer> // C? R! Value of extension
  }

Constraints

ele-1: All FHIR elements must have a @value or children (xpath: @value|f:*|h:div)
ext-1: Must have either extensions or value[x], not both (xpath: exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')]))
ele-1: On Extension.extension: All FHIR elements must have a @value or children (xpath on Extension.extension: @value|f:*|h:div)
ext-1: On Extension.extension: Must have either extensions or value[x], not both (xpath on Extension.extension: exists(f:extension)!=exists(f:*[starts-with(local-name(.), "value")]))
ele-1: On Extension.value[x]: All FHIR elements must have a @value or children (xpath on Extension.value[x]: @value|f:*|h:div)