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POJAXB: How to avoid repeated namespace definition for xmlns:xsi
 

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    <p>I have a JAXB setup where I use a @XmlJavaTypeAdapter to replace objects of type <code>Person</code> with objects of type <code>PersonRef</code> that only contains the person's UUID. This works perfectly fine. However, the generated XML redeclares the same namespace (<code>xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"</code>) every time it's used. While this is generally okay, it just doesn't feel right.</p> <p>How can I configure JAXB to declare xmlns:xsi at the very beginning of the document? Can I manually add namespace declarations to the root element?</p> <p>Here's an example of what I want to achive:</p> <p><strong>Current:</strong></p> <pre><code>&lt;person uuid="6ec0cf24-e880-431b-ada0-a5835e2a565a"&gt; &lt;relation type="CHILD"&gt; &lt;to xsi:type="personRef" uuid="56a930c0-5499-467f-8263-c2a9f9ecc5a0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/&gt; &lt;/relation&gt; &lt;relation type="CHILD"&gt; &lt;to xsi:type="personRef" uuid="6ec0cf24-e880-431b-ada0-a5835e2a565a" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/&gt; &lt;/relation&gt; &lt;!-- SNIP: some more relations --&gt; &lt;/person&gt; </code></pre> <p><strong>Wanted:</strong></p> <pre><code>&lt;person uuid="6ec0cf24-e880-431b-ada0-a5835e2a565a" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"&gt; &lt;relation type="CHILD"&gt; &lt;to xsi:type="personRef" uuid="56a930c0-5499-467f-8263-c2a9f9ecc5a0"/&gt; &lt;/relation&gt; &lt;relation type="CHILD"&gt; &lt;to xsi:type="personRef" uuid="6ec0cf24-e880-431b-ada0-a5835e2a565a"/&gt; &lt;/relation&gt; &lt;!-- SNIP: some more relations --&gt; &lt;/person&gt; </code></pre>
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