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

<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="conditional-read-status"/>
  <meta>
    <lastUpdated value="2026-03-16T22:59:53.445+00:00"/>
  </meta>
  <text>
    <status value="generated"/>
    <div xmlns="http://www.w3.org/1999/xhtml">
      <p class="res-header-id">
        <b>Generated Narrative: CodeSystem conditional-read-status</b>
      </p>
      <a name="conditional-read-status"> </a>
      <a name="hcconditional-read-status"> </a>
      <p>This case-sensitive code system 
        <code>http://hl7.org/fhir/conditional-read-status</code> defines the following codes:
      </p>
      <table class="codes">
        <tr>
          <td style="white-space:nowrap">
            <b>Code</b>
          </td>
          <td>
            <b>Display</b>
          </td>
          <td>
            <b>Definition</b>
          </td>
        </tr>
        <tr>
          <td style="white-space:nowrap">not-supported
            <a name="conditional-read-status-not-supported"> </a>
          </td>
          <td>Not Supported</td>
          <td>No support for conditional reads.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">modified-since
            <a name="conditional-read-status-modified-since"> </a>
          </td>
          <td>If-Modified-Since</td>
          <td>Conditional reads are supported, but only with the If-Modified-Since HTTP Header.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">not-match
            <a name="conditional-read-status-not-match"> </a>
          </td>
          <td>If-None-Match</td>
          <td>Conditional reads are supported, but only with the If-None-Match HTTP Header.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">full-support
            <a name="conditional-read-status-full-support"> </a>
          </td>
          <td>Full Support</td>
          <td>Conditional reads are supported, with both If-Modified-Since and If-None-Match HTTP Headers.</td>
        </tr>
      </table>
    </div>
  </text>
  <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/conditional-read-status"/>
  <identifier>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.4.201"/>
  </identifier>
  <identifier>
    <use value="old"/>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.1.191"/>
  </identifier>
  <version value="6.0.0-ballot4"/>
  <name value="ConditionalReadStatus"/>
  <title value="Conditional Read Status"/>
  <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="A code that indicates how the server supports conditional read."/>
  <jurisdiction>
    <coding>
      <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/>
      <code value="001"/>
      <display value="World"/>
    </coding>
  </jurisdiction>
  <caseSensitive value="true"/>
  <valueSet value="http://hl7.org/fhir/ValueSet/conditional-read-status"/>
  <content value="complete"/>
  <concept>
    <code value="not-supported"/>
    <display value="Not Supported"/>
    <definition value="No support for conditional reads."/>
  </concept>
  <concept>
    <code value="modified-since"/>
    <display value="If-Modified-Since"/>
    <definition value="Conditional reads are supported, but only with the If-Modified-Since HTTP Header."/>
  </concept>
  <concept>
    <code value="not-match"/>
    <display value="If-None-Match"/>
    <definition value="Conditional reads are supported, but only with the If-None-Match HTTP Header."/>
  </concept>
  <concept>
    <code value="full-support"/>
    <display value="Full Support"/>
    <definition value="Conditional reads are supported, with both If-Modified-Since and If-None-Match HTTP Headers."/>
  </concept>
</CodeSystem>