enabled

true

(optional) Determines whether the application or module is enabled. 

virtual-servers

all virtual servers 

(optional) In a comma-separated list, references id attributes of the virtual-server elements to which the web-module or the web modules within this j2ee-application are deployed.

lb-enabled

false

(optional) If true, all load-balancers that reference this application consider it available to them.

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 a lifecycle-module, j2ee-application, ejb-module, web-module, connector-module, appclient-module, or extension-module element.