The overlay element specifies additional static files overlays for this
            web application. The content of the element should be a folder in the 
            filesystem containing the static files that will overlay the webapp's
            static files, similar to what happens with regular JAR overlays.

<jboss-web xmlns="http://www.jboss.com/xml/ns/javaee"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://www.jboss.com/xml/ns/javaee http://www.jboss.org/j2ee/schema/jboss-web_10_0.xsd"
           version="10.0">
  <overlay>/home/web/content</overlay>
</jboss-web>