<bibdata type="standard">
<title language="en" type="main">Streaming Calendar and Contacts Data</title>
<date type="published"><on>2018-08-01</on></date><contributor><role type="author"/><person>
<name><completename>Michael Douglass</completename></name>
<affiliation><organization>
<name>Spherical Cow Group</name>
<address><formattedAddress>226 3rd Street<br/>Troy, NY 12180<br/>USA</formattedAddress></address></organization></affiliation><email>mdouglass@sphericalcowgroup.com</email><uri>http://sphericalcowgroup.com</uri></person></contributor><contributor><role type="author"><description>committee</description></role><organization>
<name>Internet Engineering Task Force</name>
<subdivision type="Workgroup">
<name>Calendaring Extensions</name>
</subdivision><abbreviation>IETF</abbreviation></organization></contributor><contributor><role type="publisher"/><organization>
<name>Internet Engineering Task Force</name>
<abbreviation>IETF</abbreviation></organization></contributor><language>en</language><script>Latn</script><abstract><p>This specification defines a model for streaming calendar and contact data. This allows for a more efficient method for synchronizing collections of data and may be used to augment existing protocols such as CalDAV.</p>

<note>
<name>Open Issues</name>
<ul><li><p>restype values: Need to determine what if any registry of resource types already exists and use that.</p>
</li>
</ul>
</note>
</abstract><status><stage>standard</stage></status><copyright><from>2026</from><owner><organization>
<name>Internet Engineering Task Force</name>
<abbreviation>IETF</abbreviation></organization></owner></copyright><relation type="updates">
<bibitem type="standard" schema-version="v1.5.6">
  <fetched>2026-05-22</fetched>
  
<title type="main">Internet Calendaring and Scheduling Core Object Specification (iCalendar)</title>

  <uri type="src">https://www.rfc-editor.org/info/rfc5545</uri>
  <docidentifier type="IETF" primary="true">RFC 5545</docidentifier>
  <docidentifier type="DOI">10.17487/RFC5545</docidentifier>
  <docnumber>RFC5545</docnumber>
  <date type="published">
    <on>2009-09</on>
  </date>
  <contributor>
    <role type="editor"/>
    <person>
      
<name>                    <formatted-initials language="en" script="Latn">B.</formatted-initials>          <surname language="en" script="Latn">Desruisseaux</surname>          <completename language="en" script="Latn">B. Desruisseaux</completename>       </name>

    </person>
  </contributor>
  <contributor>
    <role type="publisher"/>
    <organization>
      
<name language="en">RFC Publisher</name>

    </organization>
  </contributor>
  <contributor>
    <role type="authorizer"/>
    <organization>
      
<name language="en">RFC Series</name>

    </organization>
  </contributor>
  <contributor>
    <role type="author">
      <description>committee</description>
    </role>
    <organization>
      
<name language="en">Internet Engineering Task Force</name>

      <subdivision type="workgroup">
        
<name>Calendaring and Scheduling Standards Simplification</name>

        <identifier>calsify</identifier>
      </subdivision>
      <abbreviation language="en">IETF</abbreviation>
    </organization>
  </contributor>
  <language>en</language>
  <script>Latn</script>
  <abstract language="en" script="Latn">
    <p>This document defines the iCalendar data format for representing and exchanging calendaring and scheduling information such as events, to-dos, journal entries, and free/busy information, independent of any particular calendar service or protocol. [STANDARDS-TRACK]</p>

  </abstract>
  <status>
    <stage>PROPOSED STANDARD</stage>
  </status>
  <series>
    
<title>RFC</title>

    <number>5545</number>
  </series>
  <series type="stream">
    
<title>IETF</title>

  </series>
  <keyword>
    <vocab>calsify</vocab>
  </keyword>
  <keyword>
    <vocab>calsched</vocab>
  </keyword>
  <keyword>
    <vocab>calsch</vocab>
  </keyword>
  <keyword>
    <vocab>caldav</vocab>
  </keyword>
  <keyword>
    <vocab>calendar</vocab>
  </keyword>
  <keyword>
    <vocab>calendaring</vocab>
  </keyword>
  <keyword>
    <vocab>meeting</vocab>
  </keyword>
  <keyword>
    <vocab>event</vocab>
  </keyword>
  <keyword>
    <vocab>task</vocab>
  </keyword>
  <keyword>
    <vocab>to-do</vocab>
  </keyword>
  <keyword>
    <vocab>journal</vocab>
  </keyword>
  <keyword>
    <vocab>appointment</vocab>
  </keyword>
  <keyword>
    <vocab>agenda</vocab>
  </keyword>
  <keyword>
    <vocab>schedule</vocab>
  </keyword>
  <keyword>
    <vocab>scheduling</vocab>
  </keyword>
  <keyword>
    <vocab>ical</vocab>
  </keyword>
  <keyword>
    <vocab>icalendar</vocab>
  </keyword>
  <keyword>
    <vocab>itip</vocab>
  </keyword>
  <keyword>
    <vocab>imip</vocab>
  </keyword>
  <keyword>
    <vocab>text/calendar</vocab>
  </keyword>
  <keyword>
    <vocab>ischedule</vocab>
  </keyword>
  <keyword>
    <vocab>xCalendar</vocab>
  </keyword>
</bibitem>

</relation><relation type="updatedBy"><bibitem schema-version="v1.5.6">
  <date type="updated">
    <on>2017-07-28</on>
  </date>
  <contributor>
    <person>
      <name>          <abbreviation>MD</abbreviation>          <completename>Michael Douglass</completename>       </name>
    </person>
  </contributor>
  <edition>1</edition>
<amend change="modify"><description><p id="_be235bbc-4758-7577-33f3-b213d117772a">Examples</p>

<p id="_5dfa8c5e-6ddb-be7b-f152-4d2f08d196ba">More text for extended get. Talk about deletions.</p>
</description></amend></bibitem></relation><relation type="updatedBy"><bibitem schema-version="v1.5.6">
  <date type="updated">
    <on>2017-07-17</on>
  </date>
  <contributor>
    <person>
      <name>          <abbreviation>MD</abbreviation>          <completename>Michael Douglass</completename>       </name>
    </person>
  </contributor>
  <edition>1</edition>
<amend change="modify"><description><p id="_16bbaf28-fb13-34bb-8028-d04aa3cda6c5">Add text about OPTIONS</p>

<p id="_77b1740f-79b1-9c01-11a9-ab43537c4fb0">Add text about read/write CalDAV</p>
</description></amend></bibitem></relation><relation type="updatedBy"><bibitem schema-version="v1.5.6">
  <date type="created">
    <on>2017-02-15</on>
  </date>
  <contributor>
    <person>
      <name>          <abbreviation>MD</abbreviation>          <completename>Michael Douglass</completename>       </name>
    </person>
  </contributor>
  <edition>0</edition>
<amend change="modify"><description><p id="_eebecf3f-d045-a54d-30dc-46d8dd675649">First pass</p>
</description></amend></bibitem></relation><series type="stream">
<title>IETF</title>
</series><series type="intended">
<title>full-standard</title>
</series><keyword>icalendar</keyword><keyword>properties</keyword><ext><doctype>internet-draft</doctype><flavor>ietf</flavor><area>Applications</area><ipr>trust200902</ipr><pi><tocinclude>yes</tocinclude></pi></ext></bibdata>