enabled

true

(optional) Determines whether the application or module is enabled on the server on which it is deployed. 

virtual-servers

all virtual servers 

(optional) In a comma-separated list, references id attributes of the virtual-server elements to which the web application is deployed.

If you deploy a web application and don't specify any assigned virtual servers, the web application is assigned to all currently defined virtual servers. If you then create additional virtual servers and want to assign existing web applications to them, you must redeploy the web applications. For more information about deployment, see the Oracle GlassFish Server 3.0.1 Application Deployment Guide.

disable-timeout-in-minutes

30

(optional) Specifies the time it takes this application to reach a quiescent state after having been disabled. 

ref

none 

References the name attribute of an application element.