http://www.theserverside.com/tip/Combining-Annotation-and-XML-Configurations-in-your-Spring-3-Applications
http://stackoverflow.com/questions/182393/xml-configuration-versus-annotation-based-configuration
http://java.dzone.com/articles/fine-grained-web-authorization
http://www.ibm.com/developerworks/websphere/library/techarticles/0607_ilechko/0607_ilechko.html
http://www.code-thrill.com/2012/05/configuration-that-rocks-with-apache.html
http://www.javacodegeeks.com/2012/09/apache-digester-example-make-easy.html