jetty-overlay-deployer/src/test/resources/home/overlays/templates/myfoo=foo/WEB-INF/web-overlay.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app 
   xmlns="http://java.sun.com/xml/ns/javaee" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 
   version="2.5"> 

  <display-name>Templated Test WebApp</display-name>
  
  <context-param>
    <param-name>overlay</param-name>
    <param-value>templates/myfoo/web.xml</param-value>
  </context-param>
  <context-param>
    <param-name>template</param-name>
    <param-value>templates/myfoo/web.xml</param-value>
  </context-param>
  <context-param>
    <param-name>overlay.template</param-name>
    <param-value>${overlay.template}</param-value>
  </context-param>
  <context-param>
    <param-name>overlay.template.name</param-name>
    <param-value>${overlay.template.name}</param-value>
  </context-param>
  <context-param>
    <param-name>overlay.template.classifier</param-name>
    <param-value>${overlay.template.classifier}</param-value>
  </context-param>
  <context-param>
    <param-name>overlay.instance.classifier</param-name>
    <param-value>${overlay.instance.classifier}</param-value>
  </context-param>
  <context-param>
    <param-name>overlay.instance</param-name>
    <param-value>${overlay.instance}</param-value>
  </context-param>
</web-app>