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<li><a href="protocol-examples-policies-modifysubject.html">Modify a single subject</a></li>
<li><a href="protocol-examples-policies-retrievesubject.html">Retrieve a single subject</a></li>
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<li><a href="protocol-examples-policies-createresource.html">Create a single resource</a></li>
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<li><a href="protocol-examples-policies-errorresponses.html">Error responses</a></li>
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<h1 class="post-title-main">Namespaces and Names</h1>
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<p>Ditto uses namespaces and names for the IDs of important entity types like Things or Policies. Due to the fact that those
IDs often need to be set in the path of HTTP requests, we have restricted the set of allowed characters.</p>
<h2 id="namespace">Namespace</h2>
<p>The namespace must conform to the following notation:</p>
<ul>
<li>must start with a lower- or uppercase character from a-z</li>
<li>may use dots (<code class="highlighter-rouge">.</code>) to separate characters</li>
<li>a dot must be followed by a lower- or uppercase character from a-z</li>
<li>numbers may be used</li>
<li>underscore may be used</li>
</ul>
<p>When writing a Java application, you can use the following regex to validate your namespaces: <br />
<code class="highlighter-rouge">(?&lt;ns&gt;|(?:(?:[a-zA-Z]\w*+)(?:\.[a-zA-Z]\w*+)*+))</code>
(see <a href="https://github.com/eclipse/ditto/blob/master/model/base/src/main/java/org/eclipse/ditto/model/base/entity/id/RegexPatterns.java">RegexPatterns#NAMESPACE_REGEX</a>).</p>
<p>Examples for valid namespaces:</p>
<ul>
<li><code class="highlighter-rouge">org.eclipse.ditto</code>,</li>
<li><code class="highlighter-rouge">com.google</code>,</li>
<li><code class="highlighter-rouge">foo.bar_42</code></li>
</ul>
<h2 id="name">Name</h2>
<p>The name must conform to the following notation:</p>
<ul>
<li>may not be empty</li>
<li>may not contain <code class="highlighter-rouge">/</code> (slash)</li>
<li>may not contain control characters</li>
</ul>
<p>When writing a Java application, you can use the following regex to validate your thing name: <br />
<code class="highlighter-rouge">(?&lt;name&gt;(?:[[^\\x00-\\x1F\\x7F-\\xFF/]]|%\\p{XDigit}{2})(?:[[^\\x00-\\x1F\\x7F-\\xFF/]$]|%\\p{XDigit}{2})*+)</code>
<code class="highlighter-rouge">(!"$%&amp;()=?`*+~'#_-:.;,|&lt;&gt;\{}[]^)</code>
(see <a href="https://github.com/eclipse/ditto/blob/master/model/base/src/main/java/org/eclipse/ditto/model/base/entity/id/RegexPatterns.java">RegexPatterns#ENTITY_NAME_REGEX</a>).</p>
<p>Examples for valid names:
* <code class="highlighter-rouge">ditto</code>,
* <code class="highlighter-rouge">smart-coffee-1</code>,
* <code class="highlighter-rouge">foo%2Fbar</code>
* <code class="highlighter-rouge">foo bar</code>
* <code class="highlighter-rouge">foo+bar%20</code></p>
<h2 id="namespaced-id">Namespaced ID</h2>
<p>A namespaced ID must conform to the following expectations:</p>
<ul>
<li>namespace and name separated by a <code class="highlighter-rouge">:</code> (colon)</li>
<li>have a maximum length of 256 characters</li>
</ul>
<p>When writing a Java application, you can use the following regex to validate your namespaced IDs: <br />
<code class="highlighter-rouge">(?&lt;ns&gt;|(?:(?:[a-zA-Z]\\w*+)(?:\\.[a...\\x00-\\x1F\\x7F-\\xFF/]]|%\\p{XDigit}{2})(?:[[^\\x00-\\x1F\\x7F-\\xFF/]$]|%\\p{XDigit}{2})*+)</code>
(see <a href="https://github.com/eclipse/ditto/blob/master/model/base/src/main/java/org/eclipse/ditto/model/base/entity/id/RegexPatterns.java">RegexPatterns#ID_REGEX</a>).</p>
<p>Examples for valid IDs:</p>
<ul>
<li><code class="highlighter-rouge">org.eclipse.ditto:smart-coffee-1</code>,</li>
<li><code class="highlighter-rouge">foo:bar</code>,</li>
<li><code class="highlighter-rouge">org.eclipse.ditto_42:smart-coffeee</code>,</li>
<li><code class="highlighter-rouge">org.eclipse:admin-policy</code>,</li>
<li><code class="highlighter-rouge">org.eclipse:admin policy</code></li>
</ul>
<h2 id="encoding-and-decoding">Encoding and decoding</h2>
<p>If hex encoded characters or spaces are used in the Thing name, the protocol dependent de- or encoding must be taken into account. If a Thing is created with the ID <code class="highlighter-rouge">eclipse.ditto:foo bar</code> and is to be queried via the HTTP API, the space must be encoded accordingly:
<code class="highlighter-rouge">GET /things/eclipse.ditto:foo%20bar</code>.</p>
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