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<title> Connectivity service • Eclipse Ditto™ • a digital twin framework</title>
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<li><a href="release_notes_333.html">3.3.3</a></li>
<li><a href="release_notes_332.html">3.3.2</a></li>
<li><a href="release_notes_330.html">3.3.0</a></li>
<li><a href="release_notes_321.html">3.2.1</a></li>
<li><a href="release_notes_320.html">3.2.0</a></li>
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<li><a href="installation-building.html">Building Ditto</a></li>
<li><a href="installation-running.html">Running Ditto</a></li>
<li><a href="installation-operating.html">Operating Ditto</a></li>
<li><a href="installation-extending.html">Extending Ditto</a></li>
</ul>
</li>
<li class="subfolders">
<a href="#"><span></span>Basic concepts</a>
<ul>
<li><a href="basic-overview.html">Overview</a></li>
<li class="subfolders">
<a href="#"><span></span>Model entities</a>
<ul>
<li><a href="basic-thing.html">Thing</a></li>
<li><a href="basic-feature.html">Feature</a></li>
<li><a href="basic-policy.html">Policy</a></li>
<li><a href="basic-namespaces-and-names.html">Namespaces and Names</a></li>
<li><a href="basic-metadata.html">Thing Metadata</a></li>
<li><a href="basic-errors.html">Errors</a></li>
</ul>
</li>
<li><a href="basic-auth.html">Authentication and Authorization</a></li>
<li class="subfolders">
<a href="#"><span></span>Checking Permissions for Resources</a>
<ul>
</ul>
</li>
<li><a href="basic-messages.html">Messages</a></li>
<li><a href="basic-signals.html">Signals</a></li>
<li class="subfolders">
<a href="#"><span></span>Signal types</a>
<ul>
<li><a href="basic-signals-command.html">Command</a></li>
<li><a href="basic-signals-commandresponse.html">Command response</a></li>
<li><a href="basic-signals-errorresponse.html">Error response</a></li>
<li><a href="basic-signals-event.html">Event</a></li>
<li><a href="basic-signals-announcement.html">Announcement</a></li>
<li><a href="basic-enrichment.html">Signal enrichment</a></li>
</ul>
</li>
<li><a href="basic-apis.html">APIs</a></li>
<li><a href="basic-connections.html">Connections</a></li>
<li><a href="basic-placeholders.html">Placeholders</a></li>
<li><a href="basic-changenotifications.html">Change notifications</a></li>
<li><a href="basic-rql.html">RQL expressions</a></li>
<li><a href="basic-conditional-requests.html">Conditional requests</a></li>
<li><a href="basic-search.html">Search</a></li>
<li><a href="basic-history.html">History capabilities</a></li>
<li><a href="basic-acknowledgements.html">Acknowledgements / QoS</a></li>