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<title>Solid Notifications Use Cases and Requirements</title>
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<article about="" typeof="schema:Article doap:Specification">
<h1 property="schema:name">Solid Notifications Use Cases and Requirements</h1>
<h2>Editor’s Draft, 2023-10-18</h2>
<dl id="document-identifier">
<dt>This version</dt>
<dd><a href="https://solid.github.io/notifications-panel/notifications-ucr" rel="owl:sameAs">https://solid.github.io/notifications-panel/notifications-ucr</a></dd>
</dl>
<dl id="document-latest-version">
<dt>Latest version</dt>
<dd><a href="https://solid.github.io/notifications-panel/notifications-ucr" rel="rel:latest-version">https://solid.github.io/notifications-panel/notifications-ucr</a></dd>
</dl>
<div id="authors">
<dl id="author-name">
<dt>Editors</dt>
<dd id="Sarven-Capadisli"><span about="" rel="schema:creator schema:editor"><span about="https://csarven.ca/#i" typeof="schema:Person"><a rel="schema:url" href="https://csarven.ca/"><span about="https://csarven.ca/#i" property="schema:name"><span property="schema:givenName">Sarven</span> <span property="schema:familyName">Capadisli</span></span></a></span></span></dd>
</dl>
</div>
<dl id="document-created">
<dt>Created</dt>
<dd><time content="2021-10-27T00:00:00Z" datatype="xsd:dateTime" datetime="2021-10-27T00:00:00Z" property="schema:dateCreated">2021-10-27</time></dd>
</dl>
<dl id="document-published">
<dt>Published</dt>
<dd><time content="2021-10-27T00:00:00Z" datatype="xsd:dateTime" datetime="2021-10-27T00:00:00Z" property="schema:datePublished">2021-10-27</time></dd>
</dl>
<dl id="document-modified">
<dt>Modified</dt>
<dd><time content="2023-10-18T00:00:00Z" datatype="xsd:dateTime" datetime="2022-01-22T00:00:00Z" property="schema:dateModified">2023-10-18</time></dd>
</dl>
<dl id="document-repository">
<dt>Repository</dt>
<dd><a href="https://github.com/solid/notifications-panel" rel="doap:repository">GitHub</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></dd>
</dl>
<dl id="document-status">
<dt>Document Status</dt>
<dd prefix="pso: http://purl.org/spar/pso/" rel="pso:holdsStatusInTime" resource="#e1b46d66-3711-11ec-bce6-2fa17d3ab719"><span rel="pso:withStatus" resource="http://purl.org/spar/pso/draft" typeof="pso:PublicationStatus">Editor’s Draft</span></dd>
</dl>
<dl id="document-in-reply-to">
<dt>In Reply To</dt>
<dd><a href="https://solidproject.org/origin" rel="as:inReplyTo">Solid Origin</a></dd>
<dd><a href="https://github.com/solid/process/blob/main/notifications-panel-charter.md" rel="as:inReplyTo">Notifications Panel Charter</a></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://solid.github.io/notifications-panel/notifications-ucr#document-policy-offer" rel="odrl:uid">https://solid.github.io/notifications-panel/notifications-ucr#document-policy-offer</a></dd>
<dt>Target</dt>
<dd><a href="https://solid.github.io/notifications-panel/notifications-ucr" rel="odrl:target">https://solid.github.io/notifications-panel/notifications-ucr</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://www.w3.org/community/solid/">W3C Solid Community Group</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>
<p class="copyright">Copyright © 2021 <a href="http://www.w3.org/community/solid/">W3C Solid Community Group</a>.</p>
<div datatype="rdf:HTML" id="content" property="schema:description">
<section id="abstract">
<h2>Abstract</h2>
<div datatype="rdf:HTML" property="schema:abstract">
<p>Solid Notifications Use Cases and Requirements.</p>
<div class="issue" id="update-notifications-ucr" rel="schema:hasPart" resource="#update-notifications-ucr">
<h3 property="schema:name"><span>Issue</span>: Update Notifications UCR</h3>
<div datatype="rdf:HTML" property="schema:description">
<p>UCR needs a review/revision. Solution-centric references have no place in a UCR document. <a href="https://github.com/solid/notifications-panel/issues/76" rel="cito:citesAsRelated">issues/76</a>.</p>
</div>
</div>
</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 Editor’s Draft. The information in this document is still subject to change. You are invited to <a href="https://github.com/solid/notifications/issues">contribute</a> any feedback, comments, or questions you might have.</p>
<p>Publication as an Editor’s Draft 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>
</ol>
</li>
<li class="tocline">
<a class="tocxref" href="#use-cases"><span class="secno">2</span> <span class="content">Use Cases</span></a>
</li>
<li class="tocline">
<a class="tocxref" href="#requirements"><span class="secno">3</span> <span class="content">Requirements</span></a>
<ol>
<li><a href="#functional-considerations"><span class="secno">3.1</span> <span class="content">Functional Requirements</span></a></li>
<li><a href="#non-functional-requirements"><span class="secno">3.2</span> <span class="content">Non-Functional Requirements</span></a></li>
</ol>
</li>
<li class="tocline">
<a class="tocxref" href="#considerations"><span class="secno">12</span> <span class="content">Considerations</span></a>
<ol>
<li><a href="#privacy-considerations"><span class="secno">12.1</span> <span class="content">Privacy Considerations</span></a></li>
<li><a href="#accessibility-considerations"><span class="secno">12.2</span> <span class="content">Accessibility Considerations</span></a></li>
<li><a href="#ethical-considerations"><span class="secno">12.3</span> <span class="content">Ethical Considerations</span></a></li>
</ol>
</li>
<li class="tocline">
<a class="tocxref" href="#references"><span class="secno"></span> <span class="content">References</span></a>
<ol>
<li><a href="#informative-references"><span class="secno"></span> <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 id="motivation" rel="schema:hasPart" resource="#motivation" typeof="deo:Motivation"><span datatype="rdf:HTML" property="schema:description">Motivation...</span></p>
<p>..</p>
<p>This document is for:</p>
<ul rel="schema:audience">
<li><a href="http://data.europa.eu/esco/occupation/8cb59bc4-1f39-477e-beea-effed12d186c">Technical communicators</a> that want to develop information and media concepts, standards, structures and software tool support.</li>
</ul>
<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 property="skos:definition">This document defines the following terms. These terms are referenced throughout this document.</p>
<span rel="skos:hasTopConcept"><span resource="#foo-bar-baz"></span></span>
<dl>
<dt about="#foo-bar-baz" property="skos:prefLabel" typeof="skos:Concept"><dfn id="foo">Foo Bar Baz</dfn></dt>
<dd about="#foo-bar-baz" property="skos:definition">Foo Bar Baz...</dd>
</dl>
</div>
</section>
</div>
</section>
<section id="use-cases" inlist="" rel="schema:hasPart" resource="#use-cases" typeof="skos:Collection">
<h2 property="schema:name skos:prefLabel">Use Cases</h2>
<div datatype="rdf:HTML" property="schema:description">
<p><em>This section is non-normative.</em></p>
<section id="use-case-immediate-notification-data-changes" inlist="" rel="skos:member" resource="#use-case-immediate-notification-data-changes" typeof="skos:Concept">
<h3 property="skos:prefLabel">Immediate Notification of Data Changes</h3>
<div datatype="rdf:HTML" property="skos:definition">
<p>For many clients, it is important to know when a resource state changes. This includes collaborative editing apps, chat apps or any client that expects the underlying data to change frequently based on updates made by others.</p>
<dl id="requirements-immediate-notification-data-changes" rel="rdfs:seeAlso">
<dt>Requirements</dt>
<dd><a href="#functional-requirement-create-events">Create Events</a></dd>
<dd><a href="#functional-requirement-update-events">Update Events</a></dd>
<dd><a href="#functional-requirement-delete-events">Delete Events</a></dd>
<dd><a href="#functional-requirement-authorization">Authorization</a></dd>
<dd><a href="#functional-requirement-handling-subscription-requests">Handling Subscription Requests</a></dd>
</dl>
</div>
</section>
<section id="use-case-notification-data-changes-multiple-resources" inlist="" rel="skos:member" resource="#use-case-notification-data-changes-multiple-resources" typeof="skos:Concept">
<h3 property="skos:prefLabel">Notification of Data Changes on Multiple Resources</h3>
<div datatype="rdf:HTML" property="skos:definition">
<p>Clients might want to know state changes of multiple resources at the same time. For example, an app may simultaneously receive notifications from a container, resource(s) within the container, and/or resource(s) linked to the container.</p>
<dl id="requirements-notification-data-changes-multiple-resources" rel="rdfs:seeAlso">
<dt>Requirements</dt>
<dd><a href="#functional-requirement-create-events">Create Events</a></dd>
<dd><a href="#functional-requirement-update-events">Update Events</a></dd>
<dd><a href="#functional-requirement-delete-events">Delete Events</a></dd>
<dd><a href="#functional-requirement-authorization">Authorization</a></dd>
<dd><a href="#functional-requirement-handling-subscription-requests">Handling Subscription Requests</a></dd>
</dl>
</div>
</section>
<section id="use-case-amend-list-resources-notification-data-changes" inlist="" rel="skos:member" resource="#use-case-amend-list-resources-notification-data-changes" typeof="skos:Concept">
<h3 property="skos:prefLabel">Amend List of Resources for Notification of Data Changes</h3>
<div datatype="rdf:HTML" property="skos:definition">
<p>Clients might want to amend the list of resources from which they receive notifications of data change. This allows the client to respond to modifications made to a container, such as a resource being created or removed from within it.</p>
<dl id="requirements-amend-list-resources-notification-data-changes" rel="rdfs:seeAlso">
<dt>Requirements</dt>
<dd><a href="#functional-requirement-create-events">Create Events</a></dd>
<dd><a href="#functional-requirement-update-events">Update Events</a></dd>
<dd><a href="#functional-requirement-delete-events">Delete Events</a></dd>
<dd><a href="#functional-requirement-authorization">Authorization</a></dd>
<dd><a href="#functional-requirement-handling-subscription-modifications">Handling Subscription Modifications</a></dd>
</dl>
</div>
</section>
<section id="use-case-change-frequency" inlist="" rel="skos:member" resource="#use-case-change-frequency" typeof="skos:Concept">
<h3 property="skos:prefLabel">Frequency of Notifications</h3>
<div datatype="rdf:HTML" property="skos:definition">
<p>
Sometimes a client doesn't need to be alerted for every change. If a client only needs
infrequent updates (for example, every 5 minutes), it should be possible to avoid floods
of data that might otherwise place a higher burden on the client application. Ideally,
a client should be able to define what that aggregation window would be: for some clients,
10 seconds might be appropriate; for others, several minutes might be more appropriate.
</p>
<dl id="requirements-change-frequency" rel="rdfs:seeAlso">
<dt>Requirements</dt>
<dd><a href="#functional-requirement-create-events">Create Events</a></dd>
<dd><a href="#functional-requirement-update-events">Update Events</a></dd>
<dd><a href="#functional-requirement-delete-events">Delete Events</a></dd>
<dd><a href="#functional-requirement-event-filtering">Event Filtering</a></dd>
<dd><a href="#functional-requirement-authorization">Authorization</a></dd>
<dd><a href="#functional-requirement-handling-subscription-requests">Handling Subscription Requests</a></dd>
<dd><a href="#functional-requirement-handling-subscription-modifications">Handling Subscription Modifications</a></dd>
</dl>
</div>
</section>
<section id="use-case-filtered-notifications" inlist="" rel="skos:member" resource="#use-case-filtered-notifications" typeof="skos:Concept">
<h3 property="skos:prefLabel">Filtered Notifications</h3>
<div datatype="rdf:HTML" property="skos:definition">
<p>
Certain categories of notifications may be more or less interesting to clients.
For example, a client may not care about UPDATE operations or may only care about
notifications for resources of certain types.
</p>
<dl id="requirements-filtered-notifications" rel="rdfs:seeAlso">
<dt>Requirements</dt>
<dd><a href="#functional-requirement-create-events">Create Events</a></dd>
<dd><a href="#functional-requirement-update-events">Update Events</a></dd>
<dd><a href="#functional-requirement-delete-events">Delete Events</a></dd>
<dd><a href="#functional-requirement-event-filtering">Event Filtering</a></dd>
<dd><a href="#functional-requirement-authorization">Authorization</a></dd>
<dd><a href="#functional-requirement-handling-subscription-requests">Handling Subscription Requests</a></dd>
<dd><a href="#functional-requirement-handling-subscription-modifications">Handling Subscription Modifications</a></dd>
</dl>
</div>
</section>
<section id="use-case-time-bound-subscriptions" inlist="" rel="skos:member" resource="#use-case-time-bound-subscriptions" typeof="skos:Concept">
<h3 property="skos:prefLabel">Time-bound Subscriptions</h3>
<div datatype="rdf:HTML" property="skos:definition">
<p>
Occasionally, a client only needs a subscription to be in effect for a limited
period of time. While a client may easily close a WebSocket itself, subscriptions
for other, more asynchronous forms of notifications, such as LDN alerts or WebHook
operations, may be more difficult to terminate.
</p>
<dl id="requirements-time-bound-subscriptions" rel="rdfs:seeAlso">
<dt>Requirements</dt>
<dd><a href="#functional-requirement-create-events">Create Events</a></dd>
<dd><a href="#functional-requirement-update-events">Update Events</a></dd>
<dd><a href="#functional-requirement-delete-events">Delete Events</a></dd>
<dd><a href="#functional-requirement-authorization">Authorization</a></dd>
<dd><a href="#functional-requirement-handling-subscription-requests">Handling Subscription Requests</a></dd>
<dd><a href="#functional-requirement-handling-subscription-modifications">Handling Subscription Modifications</a></dd>
</dl>
</div>
</section>
<section id="use-case-lost-updates" inlist="" rel="skos:member" resource="#use-case-lost-updates" typeof="skos:Concept">
<h3 property="skos:prefLabel">Lost Update Notifications</h3>
<div datatype="rdf:HTML" property="skos:definition">
<p>
For WebSockets and subscriptions that rely on an active, live connection to
a notification server, the subscription channel needs to make sure that clients
do not miss notifications in the event of a dropped connection.
</p>
<dl id="requirements-lost-updates" rel="rdfs:seeAlso">
<dt>Requirements</dt>
<dd><a href="#functional-requirement-create-events">Create Events</a></dd>
<dd><a href="#functional-requirement-update-events">Update Events</a></dd>
<dd><a href="#functional-requirement-delete-events">Delete Events</a></dd>
<dd><a href="#functional-requirement-authorization">Authorization</a></dd>
</dl>
</div>
</section>
<section id="use-case-capability-discovery" inlist="" rel="skos:member" resource="#use-case-capability-discovery" typeof="skos:Concept">
<h3 property="skos:prefLabel">Capability Discovery</h3>
<div datatype="rdf:HTML" property="skos:definition">
<p>
A given Solid Notification server may support certain technologies (e.g., WebSockets and LDN)
but not others (e.g., EventSource and WebSub). Likewise, a client may not support the same set
of technologies that are implemented by a server. As such, there needs to be a mechanism for
clients and servers to agree on a mutually supported subscription type. In addition to simply
determining the set of protocols that work for client and server, there may be particular
features (e.g., notification aggregation, notification filtering) that are required by the client.
This could be used to further filter the protocol selection.
</p>
<dl id="requirements-capability-discovery" rel="rdfs:seeAlso">
<dt>Requirements</dt>
<dd><a href="#functional-requirement-capability-discovery">Capability Discovery</a></dd>
</dl>
</div>
</section>
</div>
</section>
<section id="requirements" inlist="" rel="schema:hasPart" resource="#requirements">
<h2 property="schema:name">Requirements</h2>
<div datatype="rdf:HTML" property="schema:description">
<p><em>This section is non-normative.</em></p>
<p>This section lists the functional and non-functional requirements arising from the use-cases catalogued in this document. Specific requirements that have been de-prioritized or rejected have been left in the document for completeness, but are shown as struck out.</p>
<p>The use cases and their requirements are tabulated below, followed by a definition of each requirement.</p>
<table id="table-use-cases-requirements" rel="schema:hasPart" resource="#table-use-cases-requirements" typeof="qb:DataSet">
<caption property="schema:name">Table of Use Cases and Requirements</caption>
<thead>
<tr>
<th rowspan="2">Use Case</th>
<th colspan="8">Functional Requirements</th>
<th colspan="1">Non-Functional Requirements</th>
</tr>
<tr>
<td><a href="#functional-requirement-create-events">F1</a></td>
<td><a href="#functional-requirement-update-events">F2</a></td>
<td><a href="#functional-requirement-delete-events">F3</a></td>
<td><a href="#functional-requirement-event-filtering">F4</a></td>
<td><a href="#functional-requirement-authorization">F5</a></td>
<td><a href="#functional-requirement-capability-discovery">F6</a></td>
<td><a href="#functional-requirement-handling-subscription-requests">F7</a></td>
<td><a href="#functional-requirement-handling-subscription-modifications">F8</a></td>
<td><a href="#non-functional-requirement-baz">NF1</a></td>
</tr>
</thead>
<tbody>
<tr>
<td><a href="#use-case-immediate-notification-data-changes">Immediate Notification of Data Changes</a></td>
<td>✔</td>
<td>✔</td>
<td>✔</td>
<td>⌙</td>
<td>✔</td>
<td>⌙</td>
<td>✔</td>
<td>⌙</td>
<td>⌙</td>
</tr>
<tr>
<td><a href="#use-case-notification-data-changes-multiple-resources">Notification of Data Changes on Multiple Resources</a></td>
<td>✔</td>
<td>✔</td>
<td>✔</td>
<td>⌙</td>
<td>✔</td>
<td>⌙</td>
<td>✔</td>
<td>⌙</td>
<td>⌙</td>
</tr>
<tr>
<td><a href="#use-case-amend-list-resources-notification-data-changes">Amend List of Resources for Notification of Data Changes</a></td>
<td>✔</td>
<td>✔</td>
<td>✔</td>
<td>⌙</td>
<td>✔</td>
<td>⌙</td>
<td>⌙</td>
<td>✔</td>
<td>⌙</td>
</tr>
<tr>
<td><a href="#use-case-change-frequency">Frequency of Notifications</a></td>
<td>✔</td>
<td>✔</td>
<td>✔</td>
<td>✔</td>
<td>✔</td>
<td>⌙</td>
<td>✔</td>
<td>✔</td>
<td>⌙</td>
</tr>
<tr>
<td><a href="#use-case-filtered-notifications">Filtered Notifications</a></td>
<td>✔</td>
<td>✔</td>
<td>✔</td>
<td>✔</td>
<td>✔</td>
<td>⌙</td>
<td>✔</td>
<td>✔</td>
<td>⌙</td>
</tr>
<tr>
<td><a href="#use-case-time-bound-subscriptions">Time-Bound Subscriptions</a></td>
<td>✔</td>
<td>✔</td>
<td>✔</td>
<td>⌙</td>
<td>✔</td>
<td>⌙</td>
<td>✔</td>
<td>✔</td>
<td>⌙</td>
</tr>
<tr>
<td><a href="#use-case-lost-updates">Lost Update Notifications</a></td>
<td>✔</td>
<td>✔</td>
<td>✔</td>
<td>⌙</td>
<td>✔</td>
<td>⌙</td>
<td>⌙</td>
<td>⌙</td>
<td>⌙</td>
</tr>
<tr>
<td><a href="#use-case-capability-discovery">Capability Discovery</a></td>
<td>⌙</td>
<td>⌙</td>
<td>⌙</td>
<td>⌙</td>
<td>⌙</td>
<td>✔</td>
<td>⌙</td>
<td>⌙</td>
<td>⌙</td>
</tr>
</tbody>
<tfoot>
<tr>
<td colspan="4">
<dl>
<dt><abbr title="Required by Use Case">✔</abbr></dt><dd>Required</dd>
<dt><abbr title="Inapplicable">⌙</abbr></dt><dd>Inapplicable</dd>
</dl>
</td>
</tr>
</tfoot>
</table>
<section id="functional-requirements" inlist="" rel="schema:hasPart" resource="#functional-requirements" typeof="skos:ConceptScheme">
<h3 property="schema:name skos:prefLabel">Functional Requirements</h3>
<div datatype="rdf:HTML" property="schema:description">
<p><em>This section is non-normative.</em></p>
<span rel="skos:member">
<span resource="#functional-requirement-create-events"></span>
<span resource="#functional-requirement-update-events"></span>
<span resource="#functional-requirement-delete-events"></span>
<span resource="#functional-requirement-event-filtering"></span>
<span resource="#functional-requirement-authorization"></span>
<span resource="#functional-requirement-capability-discovery"></span>
<span resource="#functional-requirement-handling-subscription-requests"></span>
<span resource="#functional-requirement-handling-subscription-modifications"></span>
</span>
<dl>
<dt about="#functional-requirement-create-events" property="skos:prefLabel" typeof="skos:Concept">F1. <dfn id="functional-requirement-create-events">Create Events</dfn></dt>
<dd about="#functional-requirement-create-events" property="skos:definition">A subscribed entity is alerted when a new resource is created.</dd>
<dt about="#functional-requirement-update-events" property="skos:prefLabel" typeof="skos:Concept">F2. <dfn id="functional-requirement-update-events">Update Events</dfn></dt>
<dd about="#functional-requirement-update-events" property="skos:definition">A subscribed entity is alerted when an existing resource is updated.</dd>
<dt about="#functional-requirement-delete-events" property="skos:prefLabel" typeof="skos:Concept">F3. <dfn id="functional-requirement-delete-events">Delete Events</dfn></dt>
<dd about="#functional-requirement-delete-events" property="skos:definition">A subscribed entity is alerted when an existing resource is deleted.</dd>
<dt about="#functional-requirement-event-filtering" property="skos:definition" typeof="skos:Concept">F4. <dfn id="functional-requirement-event-filtering">Event Filtering</dfn></dt>
<dd about="#functional-requirement-event-filtering" property="skos:definition">A subscribed entity can request a subset of all notifications.</dd>
<dt about="#functional-requirement-authorization" property="skos:definition" typeof="skos:Concept">F5. <dfn id="functional-requirement-authorization">Authorization</dfn></dt>
<dd about="#functional-requirement-authorization" property="skos:definition">Authorization is enforced on all subscriptions.</dd>
<dt about="#functional-requirement-capability-discovery" property="skos:definition" typeof="skos:Concept">F6. <dfn id="functional-requirement-capability-discovery">Capability Discovery</dfn></dt>
<dd about="#functional-requirement-capability-discovery" property="skos:definition">A client is able to discover the notification capabilities of a Solid Storage.</dd>
<dt about="#functional-requirement-handling-subscription-requests" property="skos:definition" typeof="skos:Concept">F7.
<dfn id="functional-requirement-handling-subscription-requests">Handling Subscription Requests</dfn></dt>
<dd about="#functional-requirement-handling-subscription-requests" property="skos:definition">>When a subscriber makes request for a new subscription, the Solid storage must be able to process the request including the parameters for subscription provided by the client.</dd>
<dt about="#functional-requirement-handling-subscription-modifications" property="skos:definition" typeof="skos:Concept">F8.
<dfn id="functional-requirement-handling-subscription-modifications">Handling Subscription Modifications</dfn></dt>
<dd about="#functional-requirement-handling-subscription-modifications" property="skos:definition">When a subscriber requests for parameters of a subscription to be modified, the Solid storage must be able to process the request.</dd>
</dl>
</div>
</section>
<section id="non-functional-requirements" inlist="" rel="schema:hasPart" resource="#non-functional-requirements" typeof="skos:ConceptScheme">
<h3 property="schema:name skos:prefLabel">Non-Functional Requirements</h3>
<div datatype="rdf:HTML" property="schema:description">
<p><em>This section is non-normative.</em></p>
<span rel="skos:member"><span resource="#non-functional-requirement-baz"></span></span>
<dl>
<dt about="#non-functional-requirement-baz" property="skos:prefLabel" typeof="skos:Concept">NF1. <dfn id="functional-requirement-baz">Baz</dfn></dt>
<dd about="#non-functional-requirement-baz" property="skos:definition">Baz</dd>
</dl>
</div>
</section>
</div>
</section>
<section id="considerations" inlist="" rel="schema:hasPart" resource="#considerations">
<h2 property="schema:name">Considerations</h2>
<div datatype="rdf:HTML" property="schema:description">
<p>This section details privacy, accessibility and ethical considerations.</p>
<section id="privacy-considerations" inlist="" rel="schema:hasPart" resource="#privacy-considerations">
<h3 property="schema:name">Privacy Considerations</h3>
<div datatype="rdf:HTML" property="schema:description">
<p><em>This section is non-normative.</em></p>
</div>
</section>
<section id="accessibility-considerations" inlist="" rel="schema:hasPart" resource="#accessibility-considerations">
<h3 property="schema:name">Accessibility Considerations</h3>
<div datatype="rdf:HTML" property="schema:description">
<p><em>This section is non-normative.</em></p>
</div>
</section>
<section id="ethical-considerations" inlist="" rel="schema:hasPart" resource="#ethical-considerations">
<h3 property="schema:name">Ethical Considerations</h3>
<div datatype="rdf:HTML" property="schema:description">
<p><em>This section is non-normative.</em></p>
</div>
</section>
</div>
</section>
<section class="appendix" id="references" inlist="" rel="schema:hasPart" resource="#references">
<h2 property="schema:name">References</h2>
<div datatype="rdf:HTML" property="schema:description">
<section id="informative-references" inlist="" rel="schema:hasPart" resource="#informative-references">
<h3 property="schema:name">Informative References</h3>
<div datatype="rdf:HTML" property="schema:description">
<dl class="bibliography" resource="">
<dt id="bib-ethical-web">[ETHICAL-WEB]</dt>
<dd><a href="https://www.w3.org/2001/tag/doc/ethical-web-principles/"><cite>W3C TAG Ethical Web Principles</cite></a>. Daniel Appelquist; Hadley Beeman. W3C. 27 October 2020. TAG Finding. URL: <a href="https://www.w3.org/2001/tag/doc/ethical-web-principles/">https://www.w3.org/2001/tag/doc/ethical-web-principles/</a></dd>
<dt id="bib-rfc3986">[RFC3986]</dt>
<dd><a href="https://datatracker.ietf.org/doc/html/rfc3986" rel="cito:citesAsAuthority"><cite>Uniform Resource Identifier (URI): Generic Syntax</cite></a>. T. Berners-Lee; R. Fielding; L. Masinter. IETF. January 2005. Internet Standard. URL: <a href="https://datatracker.ietf.org/doc/html/rfc3986">https://datatracker.ietf.org/doc/html/rfc3986</a></dd>
<dt id="bib-rfc6454">[RFC6454]</dt>
<dd><a href="https://datatracker.ietf.org/doc/html/rfc6454" rel="cito:citesAsAuthority"><cite>The Web Origin Concept</cite></a>. A. Barth. IETF. December 2011. Proposed Standard. URL: <a href="https://datatracker.ietf.org/doc/html/rfc6454">https://datatracker.ietf.org/doc/html/rfc6454</a></dd>
<dt id="bib-rfc7231">[RFC7231]</dt>
<dd><a href="https://httpwg.org/specs/rfc7231.html" rel="cito:citesAsAuthority"><cite>Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content</cite></a>. R. Fielding, Ed.; J. Reschke, Ed.. IETF. June 2014. Proposed Standard. URL: <a href="https://httpwg.org/specs/rfc7231.html">https://httpwg.org/specs/rfc7231.html</a></dd>
<dt id="bib-solid-protocol">[SOLID-PROTOCOL]</dt>
<dd><a href="https://solidproject.org/TR/protocol" rel="cito:citesAsAuthority"><cite>Solid Protocol</cite></a>. Sarven Capadisli; Tim Berners-Lee; Ruben Verborgh; Kjetil Kjernsmo; Justin Bingham; Dmitri Zagidulin. W3C Solid Community Group. W3C Editor’s Draft. URL: <a href="https://solidproject.org/TR/protocol">https://solidproject.org/TR/protocol</a></dd>
<dt id="bib-webarch">[WEBARCH]</dt>
<dd><a href="https://www.w3.org/TR/webarch/" rel="cito:citesAsAuthority"><cite>Architecture of the World Wide Web, Volume One</cite></a>. Ian Jacobs; Norman Walsh. W3C. 15 December 2004. W3C Recommendation. URL: <a href="https://www.w3.org/TR/webarch/">https://www.w3.org/TR/webarch/</a></dd>
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