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<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta charset="utf-8" />
<title>Solid Chat</title>
<meta content="width=device-width, initial-scale=1" name="viewport" />
<link
href="https://www.w3.org/StyleSheets/TR/2021/W3C-ED"
media="all"
rel="stylesheet"
title="W3C-ED"
/>
<style>
body {
counter-reset: section;
counter-reset: sub-section;
}
em.rfc2119 {
color: #900;
}
code,
samp {
color: #c83500;
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pre code,
pre samp {
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font-weight: inherit;
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clear: both;
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header address img[src*="logos/W3C"] {
background: #1a5e9a none repeat scroll 0 0;
border-color: #1a5e9a;
border-image: none;
border-radius: 0.4rem;
border-style: solid;
border-width: 0.65rem 0.7rem 0.6rem;
color: white;
display: block;
font-weight: bold;
}
main article > h1 {
font-size: 220%;
font-weight: bold;
}
article
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</style>
</head>
<body
about=""
prefix="rdf: http://www.w3.org/1999/02/22-rdf-syntax-ns# rdfs: http://www.w3.org/2000/01/rdf-schema# owl: http://www.w3.org/2002/07/owl# xsd: http://www.w3.org/2001/XMLSchema# dcterms: http://purl.org/dc/terms/ skos: http://www.w3.org/2004/02/skos/core# prov: http://www.w3.org/ns/prov# mem: http://mementoweb.org/ns# qb: http://purl.org/linked-data/cube# schema: http://schema.org/ doap: http://usefulinc.com/ns/doap# deo: http://purl.org/spar/deo/ fabio: http://purl.org/spar/fabio/ cito: http://purl.org/spar/cito/ as: https://www.w3.org/ns/activitystreams# ldp: http://www.w3.org/ns/ldp# earl: http://www.w3.org/ns/earl# spec: http://www.w3.org/ns/spec# rel: https://www.w3.org/ns/iana/link-relations/relation# odrl: http://www.w3.org/ns/odrl/2/"
typeof="schema:CreativeWork prov:Entity as:Article"
>
<header>
<address>
<a class="logo" href="https://solidproject.org/"
><img
height="66"
width="72"
alt="Solid Project"
src="https://solidproject.org/TR/solid.svg"
/></a>
</address>
</header>
<main>
<article about="" typeof="schema:Article doap:Specification">
<h1 property="schema:name">Solid Chat</h1>
<h2>Version <span property="doap:revision">1.0.0</span>, Editor’s Draft, 2023-08-21</h2>
<details open="">
<summary>More details about this document</summary>
<dl id="document-identifier">
<dt>This version</dt>
<dd>
<a href="https://solid.github.io/chat/" rel="owl:sameAs"
>https://solid.github.io/chat/</a
>
</dd>
</dl>
<!--
<dl id="document-latest-version">
<dt>Latest version</dt>
<dd>
<a
href="https://solid.github.io/chat/"
rel="rel:latest-version"
>https://solid.github.io/chat/</a
>
</dd>
</dl>
<dl id="document-latest-published-version">
<dt>Latest published version</dt>
<dd>
<a
href="https://solid.github.io/chat/"
rel="rdfs:seeAlso"
>https://solid.github.io/chat/</a
>
</dd>
</dl>
-->
<dl id="document-editors">
<dt>Editors</dt>
<dd id="Tim-Berners-Lee">
<span about="" rel="schema:editor schema:author"
><span
about="https://www.w3.org/People/Berners-Lee/card#i"
typeof="schema:Person"
><a
rel="schema:url"
href="https://www.w3.org/People/Berners-Lee/"
><span
about="https://www.w3.org/People/Berners-Lee/card#i"
property="schema:name"
><span property="schema:givenName">Tim</span>
<span property="schema:familyName"
>Berners-Lee</span
></span
></a
></span
></span
>
</dd>
</dl>
<dl id="document-contributors">
<dt>Contributors</dt>
<dd id="Hadrian-Zbarcea">
<span about="" rel="schema:editor schema:author"
><span about="https://hadrian.solidcommunity.net/profile/card#me" typeof="schema:Person"
><a rel="schema:url" href="https://hadrian.solidcommunity.net/profile/card#me"
><span about="https://hadrian.solidcommunity.net/profile/card#me" property="schema:name"
><span property="schema:givenName">Hadrian</span>
<span property="schema:familyName">Zbarcea</span></span
></a
></span
></span
>
</dd>
</dl>
<dl id="document-created">
<dt>Created</dt>
<dd>
<time
content="2023-08-20T14:00:00Z"
datatype="xsd:dateTime"
datetime="2023-08-20T00:00:00Z"
property="schema:dateCreated"
>2023-08-20</time
>
</dd>
</dl>
<!--
<dl id="document-published">
<dt>Published</dt>
<dd>
<time
content="2023-08-21T00:00:00Z"
datatype="xsd:dateTime"
datetime="2023-08-21T00:00:00Z"
property="schema:datePublished"
>2023-08-21</time
>
</dd>
</dl>
<dl id="document-modified">
<dt>Modified</dt>
<dd>
<time
content="2023-08-21T00:00:00Z"
datatype="xsd:dateTime"
datetime="22023-08-21T00:00:00Z"
property="schema:dateModified"
>2023-08-21</time
>
</dd>
</dl>
-->
<dl id="document-repository">
<dt>Repository</dt>
<dd>
<a
href="https://github.com/solid/chat"
rel="doap:repository"
>GitHub</a
>
</dd>
<dd>
<a
href="https://github.com/solid/chat/issues"
rel="doap:bug-database"
>Issues</a
>
</dd>
</dl>
<dl id="document-language">
<dt>Language</dt>
<dd>
<span content="en" lang="" property="dcterms:language" xml:lang=""
>English</span
>
</dd>
</dl>
<dl id="document-license">
<dt>License</dt>
<dd>
<a
href="http://purl.org/NET/rdflicense/MIT1.0"
rel="schema:license"
>MIT License</a
> but <b>all code snippets are in the public domain</b>, CC0.
</dd>
</dl>
<dl id="document-status">
<dt>Document Status</dt>
<dd
prefix="pso: http://purl.org/spar/pso/"
rel="pso:holdsStatusInTime"
resource="#dc0d85a0-2f9d-43ca-b678-1ad0d84e6bf5"
>
<span
rel="pso:withStatus"
resource="http://purl.org/spar/pso/draft"
typeof="pso:PublicationStatus"
>Editor’s Draft</span
>
</dd>
</dl>
<dl id="document-policy">
<dt>Policy</dt>
<dd>
<dl
id="document-policy-offer"
rel="odrl:hasPolicy"
resource="#document-policy-offer"
typeof="odrl:Policy"
>
<dt>Rule</dt>
<dd>
<a
about="#document-policy-offer"
href="https://www.w3.org/TR/odrl-vocab/#term-Offer"
typeof="odrl:Offer"
>Offer</a
>
</dd>
<dt>Unique Identifier</dt>
<dd>
<a
href="https://solidproject.org/TR/chat#document-policy-offer"
rel="odrl:uid"
>https://solidproject.org/TR/chat#document-policy-offer</a
>
</dd>
<dt>Target</dt>
<dd>
<a
href="https://solidproject.org/TR/chat"
rel="odrl:target"
>https://solidproject.org/TR/chat</a
>
</dd>
<dt>Permission</dt>
<dd>
<dl
id="document-permission"
rel="odrl:permission"
resource="#document-permission"
typeof="odrl:Permission"
>
<dt>Assigner</dt>
<dd>
<a
rel="odrl:assigner"
href="https://github.com/solid/"
>Solid Organization</a
>
</dd>
<dt>Action</dt>
<dd>
<ul rel="odrl:action">
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-aggregate"
resource="odrl:aggregate"
>Aggregate</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-archive"
resource="odrl:archive"
>Archive</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-concurrentUse"
resource="odrl:concurrentUse"
>Concurrent Use</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-DerivativeWorks"
resource="http://creativecommons.org/ns#DerivativeWorks"
>Derivative Works</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-derive"
resource="odrl:derive"
>Derive</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-digitize"
resource="odrl:digitize"
>Digitize</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-display"
resource="odrl:display"
>Display</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-Distribution"
resource="http://creativecommons.org/ns#Distribution"
>Distribution</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-index"
resource="odrl:index"
>Index</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-inform"
resource="odrl:inform"
>Inform</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-install"
resource="odrl:install"
>Install</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-Notice"
resource="http://creativecommons.org/ns#Notice"
>Notice</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-present"
resource="odrl:present"
>Present</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-print"
resource="odrl:print"
>Print</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-read"
resource="odrl:read"
>Read</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-reproduce"
resource="odrl:reproduce"
>Reproduce</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-Reproduction"
resource="http://creativecommons.org/ns#Reproduction"
>Reproduction</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-stream"
resource="odrl:stream"
>Stream</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-synchronize"
resource="odrl:synchronize"
>Synchronize</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-textToSpeech"
resource="odrl:textToSpeech"
>Text-to-speech</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-transform"
resource="odrl:transform"
>Transform</a
>
</li>
<li>
<a
href="https://www.w3.org/TR/odrl-vocab/#term-translate"
resource="odrl:translate"
>Translate</a
>
</li>
</ul>
</dd>
</dl>
</dd>
</dl>
</dd>
</dl>
</details>
<p class="copyright">
W3C License. Copyright © 2022-2023
<a href="http://github.com/solid/"
>W3C</a>. All code snippets public domain.
</p>
<div datatype="rdf:HTML" id="content" property="schema:description">
<section id="abstract">
<h2>Abstract</h2>
<div datatype="rdf:HTML" property="schema:abstract">
A Solid chat channel is a object in a Solid pod which allows
a series of text (or multimedia) messages over time to be
accumulated as an interactive discussion between one or more people (or other agents)
Chat messages are written directly by the participants into a series of chat files
organized by date. Participants watch the current chat file for updates in real time
using Solid Live Update functionality.
A chat channel may also have just one author, in which case
it can function as a private "note to self" or as public or shared stream of thoughts.
This format is designed to be able to interoperate with existing chat systems like
Internet Relay Chat, Matrix, etc. The original version did not include threads or replies,
but this one does.
Also included is the use of social reactions, for which schema.org's Action
class and subclasses are used, with literal emojis as content.
This format is also designed to be
suitable for archives of channels using other protocols.
</div>
</section>
<section id="sotd" inlist="" rel="schema:hasPart" resource="#sotd">
<h2 property="schema:name">Status of This Document</h2>
<div property="schema:description" datatype="rdf:HTML">
<p>
This section describes the status of this document at the time
of its publication.
</p>
<p>
This document was published by the
<a href="https://www.w3.org/community/solid/"
>Solid Community Group</a
>
as an <em>Editor’s Draft</em>. The information in this document
is still subject to change. You are invited to
<a href="https://github.com/solid/chat/issues"
>contribute</a
>
any feedback, comments, or questions you might have.
</p>
<p>
Publication as an <em>Editor’s Draft</em> does not imply
endorsement by the
<abbr title="World Wide Web Consortium">W3C</abbr> Membership.
This is a draft document and may be updated, replaced or
obsoleted by other documents at any time. It is inappropriate to
cite this document as other than work in progress.
</p>
<p>
This document was produced by a group operating under the
<a href="https://www.w3.org/community/about/agreements/cla/"
>W3C Community Contributor License Agreement (CLA)</a
>. A human-readable
<a
href="https://www.w3.org/community/about/agreements/cla-deed/"
>summary</a
>
is available.
</p>
</div>
</section>
<nav id="toc">
<h2 id="table-of-contents">Table of Contents</h2>
<div>
<ol class="toc">
<li class="tocline">
<a class="tocxref" href="#abstract">Abstract</a>
</li>
<li class="tocline">
<a class="tocxref" href="#sotd">Status of This Document</a>
</li>
<li class="tocline">
<a class="tocxref" href="#introduction"
><span class="secno">1</span>
<span class="content">Introduction</span></a
>
<ol>
<li>
<a href="#terminology"
><span class="secno">1.1</span>
<span class="content">Terminology</span></a
>
</li>
<li>
<a href="#namespaces"
><span class="secno">1.2</span>
<span class="content">Namespaces</span></a
>
</li>
<li>
<a href="#conformance"
><span class="secno">1.3</span>
<span class="content">Conformance</span></a
>
</li>
</ol>
</li>
<li class="tocline">
<a href="#channel"
><span class="secno">2</span>
<span class="content">Chat Channel</span></a>
</li>
<li class="tocline">
<a href="#message"
><span class="secno">3</span>
<span class="content">Chat Message</span></a>
</li>
<li class="tocline">
<a href="#replies"
><span class="secno">4</span>
<span class="content">Threads and Replies</span></a>
</li>
<li class="tocline">
<a href="#modified"
><span class="secno">5</span>
<span class="content">Deleted and Modified Messages</span></a>
</li>
<li class="tocline">
<a href="#actions"
><span class="secno">6</span>
<span class="content">Actions</span></a>
</li>
<li class="tocline">
<a href="#access-control"
><span class="secno">7</span>
<span class="content">Access Control</span></a>
</li>
<li class="tocline">
<a href="#preferences"
><span class="secno">8</span>
<span class="content">Preferences</span></a>
</li>
<li class="tocline">
<a href="#discovery"
><span class="secno">9</span>
<span class="content">Discovery</span></a>
</li>
<li class="tocline">
<a href="#considerations"
><span class="secno">10</span>
<span class="content">Considerations</span></a
>
<ol>
<li>
<a class="tocxref" href="#security-considerations"
><span class="secno">10.1</span>
<span class="content">Security Considerations</span></a
>
</li>
<li>
<a class="tocxref" href="#privacy-considerations"
><span class="secno">10.2</span>
<span class="content">Privacy Considerations</span></a
>
</li>
<li>
<a class="tocxref" href="#i18n-considerations"
><span class="secno">10.3</span>
<span class="content">Internationalization Considerations</span></a
>
</li>
<li>
<a class="tocxref" href="#accy-considerations"
><span class="secno">10.4</span>
<span class="content">Accessibility Considerations</span></a
>
</li>
</ol>
</li>
<li class="tocline">
<a class="tocxref" href="#references">References</a>
<ol>
<li>
<a class="tocxref" href="#Normative-References"
>
<span class="content">Normative References</span></a
>
</li>
</ol>
<ol>
<li>
<a class="tocxref" href="#Informative-References"
>
<span class="content">Informative References</span></a
>
</li>
</ol>
</li>
</ol>
</div>
</nav>
<section
id="introduction"
inlist=""
rel="schema:hasPart"
resource="#introduction"
>
<h2
about="#introduction"
property="schema:name"
typeof="deo:Introduction"
>
Introduction
</h2>
<div datatype="rdf:HTML" property="schema:description">
<p><em>This section is non-normative.</em></p>
<p>
A solid chat channel provides functionality similar to the functionality
of chat protocols like IRC channels and Matrix rooms, and like
platforms such as Slack, WhatsApp chat, and so on.
Anyone can host a chat on their pod, and invite others to join (or not).
Those who are allowed to participate in the channel are given
Append mode access to a part of the pod where they can create
new chat files and add messages to existing ones.
Deletion and modification of messages are done not by changing
the existing message, but by appending more information to note that
it has been edited or deleted.
</p>
<p>Apart from the messages themselves, which are in dated directories (LDP containers)
there is preferences information controlling the display format and options
and a list of those participating.
</p>
<p>This specification is part of the work called
for by the <a href="https://solidproject.solidcommunity.net/Verticals/Roadmap/state.ttl#Iss1595501681113">The Chat - Instant Messages</a>
item in the <a href="https://solidproject.solidcommunity.net/Verticals/Roadmap/index.ttl#this">Solid Verticals Roadmap</a>.
It is a client-client specification, in that the pod server does not need to be aware of it at all.
The clients - Solid Apps - use it to make the chat data interoperable across different apps.
</p>
</div>
<section
id="terminology"
inlist=""
rel="schema:hasPart"
resource="#terminology"
typeof="skos:ConceptScheme"
>
<h3 property="schema:name skos:prefLabel">Terminology</h3>
<div datatype="rdf:HTML" property="schema:description">
<p><em>This section is non-normative.</em></p>
<p>
This document uses terminology from the
<cite
><a href="https://solidproject.org/TR/protocol"
>Solid Protocol</a
></cite
>
[<cite
><a class="bibref" href="#bib-solid-protocol"
>SOLID-PROTOCOL</a
></cite
>] and
<cite
><a href="https://www.w3.org/2005/Incubator/webid/spec/identity/"
>WebID</a
></cite
>
[<cite><a class="bibref" href="#bib-webid">WebID</a></cite
>] specifications. When terminology is used from these specifications it is linked directly to them.
</p>
<dl rel="skos:hasTopConcept">
<dt
about="#webid"
property="skos:prefLabel"
typeof="skos:Concept"
>WebID</dt>
<dd>
A <dfn id="webid">WebID</dfn> is a URI with an HTTP or HTTPS scheme which denotes an Agent
(Person, Organization, Group, autonomous software agent (bot), etc.). For WebIDs with fragment identifiers (e.g. #me),
the URI without the fragment denotes the Profile Document.
For WebIDs without fragment identifiers an HTTP request on the WebID
returns a 303 with a Location header URI referring to the Profile Document.
</dd>
</dl>
</div>
</section>
<section
id="namespaces"
inlist=""
rel="schema:hasPart"
resource="#namespaces"
>
<h3 property="schema:name">Namespaces</h3>
<div datatype="rdf:HTML" property="schema:description">
<table>
<caption>
Prefixes and Namespaces
</caption>
<thead>
<tr>
<th>Prefix</th>
<th>Namespace</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>rdf</code></td>
<td>http://www.w3.org/1999/02/22-rdf-syntax-ns#</td>
<td>
[<cite
><a class="bibref" href="#bib-rdf-schema"
>rdf-schema</a
></cite
>]
</td>
</tr>
<tr>
<td><code>solid</code></td>
<td>http://www.w3.org/ns/solid/terms#</td>
<td>Solid Terms</td>
</tr>
<tr>
<td><code>vcard</code></td>
<td>http://www.w3.org/2006/vcard/ns#</td>
<td>
[<cite
><a class="bibref" href="#bib-vcard"
>VCARD-RDF</a
></cite
>]
</td>
</tr>
<tr>
<td><code>schema</code></td>
<td>http://schema.org/</td>
<td>schema.org
</td>
</tr>
<tr>
<td><code>meeting</code></td>
<td>http://www.w3.org/ns/pim/meeting#</td>
<td>Meeting ontology
</td>
</tr>
<tr>
<td><code>wf</code></td>
<td>http://www.w3.org/2005/01/wf/flow#</td>
<td>Workflow ontology
</td>
</tr>
</tbody>
</table>
</div>
</section>
<section
id="conformance"
inlist=""
rel="schema:hasPart"
resource="#conformance"
>
<h3 property="schema:name">Conformance</h3>
<div datatype="rdf:HTML" property="schema:description">
<p>
All assertions, diagrams, examples, and notes are
non-normative, as are all sections explicitly marked
non-normative. Everything else is normative.
</p>
<p>All shapes <em>are</em> normative, though they open: they allow other data to be added.</p>
<p>Notes in this document are not normative, are shown like this:</p>
<p class="note">This is a note.</p>
<p>
Examples in this specification are introduced with the word "for example" or
are set apart from the normative text like this:
</p>
<figure
class="example listing"
id="example"
rel="schema:hasPart"
resource="#example"
>
<p class="example-h">