From: Colin Fleming <colin.mailinglist_at_gmail.com>
Date: Wed, 19 Nov 2008 09:28:03 +0100

Hi all,

The problem that we had with the prefix mapper was that it doesn't allow you
to remove the namespaces that JAXB declares automatically (i.e. the ones
statically known by the JAXBContext). For performance (and convenience)
reasons we create a single JAXBContext that's aware of many different
document types, and JAXB ends up adding about 60 namespace declarations to
each document. The prefix mapper doesn't help with that.

Cheers,
Colin