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

Asked 2010-02-12T13:25:50.850
20

I have a JAXB setup where I use a @XmlJavaTypeAdapter to replace objects of type Person with objects of type PersonRef that only contains the person's UUID. This works perfectly fine. However, the generated XML redeclares the same namespace (xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance") every time it's used. While this is generally okay, it just doesn't feel right.

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?

Here's an example of what I want to achive:

Current:

<person uuid="6ec0cf24-e880-431b-ada0-a5835e2a565a">
    <relation type="CHILD"> 
        <to xsi:type="personRef" uuid="56a930c0-5499-467f-8263-c2a9f9ecc5a0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/> 
    </relation> 
    <relation type="CHILD"> 
        <to xsi:type="personRef" uuid="6ec0cf24-e880-431b-ada0-a5835e2a565a" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/> 
    </relation>
    <!-- SNIP: some more relations -->
</person>

Wanted:

<person uuid="6ec0cf24-e880-431b-ada0-a5835e2a565a" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <relation type="CHILD"> 
        <to xsi:type="personRef" uuid="56a930c0-5499-467f-8263-c2a9f9ecc5a0"/> 
    </relation> 
    <relation type="CHILD"> 
        <to xsi:type="personRef" uuid="6ec0cf24-e880-431b-ada0-a5835e2a565a"/> 
    </relation>
    <!-- SNIP: some more relations -->
</person>
java xml jaxb
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1 Answer

9

2013: It looks like a JAXB customization Namespace mapper issue:

When you marshall an XML document using JAXB 1.0, a Marshaller object, a JAXB object that controls the process of marshalling, provides namespace declarations in the resulting XML document. Sometimes the Marshaller produces a lot of namespace declarations that look redundant, for example:

  <?xml version="1.0"?>
  <root>
     <ns1:element xmlns:ns1="urn:foo"> ... </ns1:element>
     <ns2:element xmlns:ns2="urn:foo"> ... </ns2:element>
     <ns3:element xmlns:ns3="urn:foo"> ... </ns3:element>
  </root>

JAXB 2.0 changes this behavior. If you use JAXB 2.0 (or later) to marshal an XML document, the Marshaller declares all statically known namespace Uniform Resource Identifiers (URIs), that is, those URIs that are used as element or attribute names in JAXB annotations.

JAXB may also declare additional namespaces in the middle of an XML document, for example when a qualified name (QName) that is used as an attribute or element value requires a new namespace URI, or when a Document Object Model (DOM) node in a content tree requires a new namespace URI. This behavior might produce an XML document that has a lot of namespace declarations with automatically-generated namespace prefixes.

The problem is that automatically-generated namespace prefixes such as ns1, ns2, and ns3, are not user friendly -- they typically do not help people understand the marshalled XML.

Fortunately, JAXB 2.0 (or later) provides a service provider interface (SPI) named answered 2010-02-22T13:10:04.967

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