jaxb-ri/docs/release-documentation/src/docbook/users-guide-marshalling-changing-prefixes.xml

<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book [
<!ENTITY % ents SYSTEM "docbook.ent">
%ents;
]>
<section version="5.0" xml:id="marshalling-changing-prefixes" xml:lang="en"
         xmlns="http://docbook.org/ns/docbook"
         xmlns:xlink="http://www.w3.org/1999/xlink"
         xmlns:ns5="http://www.w3.org/1999/xhtml"
         xmlns:ns3="http://www.w3.org/2000/svg"
         xmlns:ns="http://docbook.org/ns/docbook"
         xmlns:m="http://www.w3.org/1998/Math/MathML">
    <title>Changing prefixes</title>

    <para>By default, a &binding.spec.name; marshaller uses random namespace prefixes (such
    as <literal>ns1</literal>, <literal>ns2</literal>, ...) when it needs to declare new
    namespace URIs. While this is perfectly valid XML wrt the schema, for
    human readability, you might want to change them to something that makes
    more sense.</para>

    <para>The &binding.impl.name; defines NamespacePrefixMapper to allow you to do this. See
    the <literal>namespace-prefix</literal> sample in the distribution for more
    details.</para>
</section>