... We can note that the features XML has a schema. Take a look on Features XML Schema section of the user guide for details. The feature1 feature is available in version certificates for WS- Security. A very simple XML schema for spring has been defined, allowing the deployment of a new realm or a new keystore very easily. SCHEMA To override or deploy a new realm, you can namespace handler and can thus be defined in a Spring xml configuration file. Following is the XML Schema to use when defining Karaf realms: 3