---
type: "codesystem"
title: "Operation Synchronicity Control"
codesystem: "synchronicity-control"
---
# Operation Synchronicity Control

- **Official URL**: http://hl7.org/fhir/synchronicity-control
- **Version**: 6.0.0
- **Status**: active
- **Name**: OperationSynchronicityControl
- **Title**: Operation Synchronicity Control
- **Publisher**: HL7 (FHIR Project)
- **Description**: Indicates that an operation must always be handled as synchronous or asynchronous, or that the server must provide both, and clients can choose
- **Case Sensitive**: true
- **Content**: complete

## Concepts

| Code | Display | Definition |
| --- | --- | --- |
| synchronous | Synchronous | This operation is invoked synchronously |
| asynchronous | Asynchronous | This operation is invoked asynchronously. |
| either | System | This operation can be invoked either synchronously or asynchronously. |

## CodeSystem XML



```xml
<?xml version="1.0" encoding="UTF-8"?>

<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="synchronicity-control"/>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="fhir"/>
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status">
    <valueCode value="normative"/>
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="5"/>
  </extension>
  <url value="http://hl7.org/fhir/synchronicity-control"/>
  <version value="6.0.0"/>
  <name value="OperationSynchronicityControl"/>
  <title value="Operation Synchronicity Control"/>
  <status value="active"/>
  <experimental value="false"/>
  <date value="2021-01-05T10:01:24+11:00"/>
  <publisher value="HL7 (FHIR Project)"/>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="http://hl7.org/fhir"/>
    </telecom>
    <telecom>
      <system value="email"/>
      <value value="fhir@lists.hl7.org"/>
    </telecom>
  </contact>
  <description value="Indicates that an operation must always be handled as synchronous or asynchronous, or that the server must provide both, and clients can choose"/>
  <caseSensitive value="true"/>
  <valueSet value="http://hl7.org/fhir/ValueSet/synchronicity-control"/>
  <content value="complete"/>
  <concept>
    <code value="synchronous"/>
    <display value="Synchronous"/>
    <definition value="This operation is invoked synchronously"/>
  </concept>
  <concept>
    <code value="asynchronous"/>
    <display value="Asynchronous"/>
    <definition value="This operation is invoked asynchronously."/>
  </concept>
  <concept>
    <code value="either"/>
    <display value="System"/>
    <definition value="This operation can be invoked either synchronously or asynchronously."/>
  </concept>
</CodeSystem>
```