FHIR Release 3 (STU) 4

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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 minimum 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: Questionnaire.item, Questionnaire.item.item usage info: insert a list of places where this extension is used Element ID Questionnaire.item or Element ID Questionnaire.item.item, with Context Invariant = type!='display' and (repeats=true or %extension.valueInteger=1)

Extension Content

Summary

Name Flags Card. Type Description & Constraints doco
. . extension maxOccurs 0..1 integer URL = http://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs
maxOccurs: The maximum number of times the group must appear, or the minimum maximum number of answers for a question - when greater than 1 and not unlimited.


Use on element: Questionnaire.item, Questionnaire.item.item 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>

doco Documentation for this format

Full Structure

Name Flags Card. Type Description & Constraints doco
. . extension 0..1 Extension URL = http://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs
maxOccurs: The maximum number of times the group must appear, or the minimum maximum number of answers for a question - when greater than 1 and not unlimited.


Use on element: Questionnaire.item, Questionnaire.item.item 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" "http://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs"
. . valueInteger . value[x] I 0..1 1..1 integer Value of extension

doco Documentation for this format

XML Template 

<!-- maxOccurs -->doco

< xmlns="http://hl7.org/fhir"

<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 doco
. . extension maxOccurs 0..1 integer URL = http://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs
maxOccurs: The maximum number of times the group must appear, or the minimum maximum number of answers for a question - when greater than 1 and not unlimited.


Use on element: Questionnaire.item, Questionnaire.item.item 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>

doco Documentation for this format

Full Structure

Name Flags Card. Type Description & Constraints doco
. . extension 0..1 Extension URL = http://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs
maxOccurs: The maximum number of times the group must appear, or the minimum maximum number of answers for a question - when greater than 1 and not unlimited.


Use on element: Questionnaire.item, Questionnaire.item.item 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" "http://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs"
. . valueInteger . value[x] I 0..1 1..1 integer Value of extension

doco Documentation for this format

XML Template 

<!-- maxOccurs -->doco

< xmlns="http://hl7.org/fhir"

<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 )