In
http://www.jboss.org/file-access/default/members/resteasy/freezone/docs/1.2.GA/userguide/html_single/index.html#Maven_and_RESTEasy
there is the following
[...]

<!-- JAXB + Atom support -->
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-atom-provider</artifactId>
<version>1.2.GA</version>
</dependency>
<!-- JAXB + Atom support -->
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-atom-provider</artifactId>
<version>1.2.GA</version>
</dependency>
[...]
One could probably go away.