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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#L42">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 contain lower- and uppercase characters from a-z</li>
<li>numbers may be used</li>
<li>may contain hex encoded characters, e.g. <code class="highlighter-rouge">%3A</code>, <code class="highlighter-rouge">%4B</code></li>
<li>may also contain the characters: <code class="highlighter-rouge">-</code> (hyphen), <code class="highlighter-rouge">:</code> (colon), <code class="highlighter-rouge">@</code> (at sign), <code class="highlighter-rouge">&amp;</code> (ampersand), <code class="highlighter-rouge">=</code> (equals sign),
<code class="highlighter-rouge">+</code> (plus sign), <code class="highlighter-rouge">,</code> (comma), <code class="highlighter-rouge">.</code> (period), <code class="highlighter-rouge">!</code> (exclamation mark), <code class="highlighter-rouge">~</code> (tilde), <code class="highlighter-rouge">*</code> (asterisk), <code class="highlighter-rouge">'</code> (apostrophe),
<code class="highlighter-rouge">_</code> (underscore), <code class="highlighter-rouge">;</code> (semicolon), <code class="highlighter-rouge">&lt;</code> (less-than sign), <code class="highlighter-rouge">&gt;</code> (greater-than sign), <code class="highlighter-rouge">$</code> (dollar sign)</li>
<li>may not start with <code class="highlighter-rouge">$</code> (dollar sign)</li>
</ul>
<p>When writing a Java application, you can use the following regex to validate your namespaces: <br />
<code class="highlighter-rouge">(?&lt;name&gt;(?:[-\w:@&amp;=+,.!~*'_;&lt;&gt;]|%\p{XDigit}{2})(?:[-\w:@&amp;=+,.!~*'_;&lt;&gt;$]|%\p{XDigit}{2})*+)</code>
(see <a href="https://github.com/eclipse/ditto/blob/master/model/base/src/main/java/org/eclipse/ditto/model/base/entity/id/RegexPatterns.java#L85">RegexPatterns#ENTITY_NAME_REGEX</a>).</p>
<p>Examples for valid names:
* <code class="highlighter-rouge">ditto</code>,
* <code class="highlighter-rouge">smart-coffee-1</code>,
* <code class="highlighter-rouge">foo%2Fbar</code></p>
<h2 id="namespaced-id">Namespaced ID</h2>
<p>A namespaced ID must conform to the following expectations:</p>
<ul>
<li>namespace and name separated by a <code class="highlighter-rouge">:</code> (colon)</li>
<li>have a maximum length of 256 characters</li>
</ul>
<p>When writing a Java application, you can use the following regex to validate your namespaced IDs: <br />
<code class="highlighter-rouge">(?&lt;ns&gt;|(?:(?:[a-zA-Z]\w*+)(?:\.[a-zA-Z]\w*+)*+)):(?&lt;name&gt;(?:[-\w:@&amp;=+,.!~*'_;&lt;&gt;]|%\p{XDigit}{2})(?:[-\w:@&amp;=+,.!~*'_;&lt;&gt;$]|%\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#L92">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>
</ul>
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