This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
Plugins can be configured by providing a <configuration> element within the <plugin> declaration. So you posted the configuration, but never identified the plugin. Without knowing which plugin, there is no way of knowing what the configuration means. Therefore, please post the full <plugin> entry that contains this <configuration>