com.opensymphony.xwork
Interfaces 
Action
ActionInvocation
ActionProxy
LocaleProvider
ModelDriven
Preparable
Result
TextProvider
Validateable
ValidationAware
XWorkMessages
Classes 
ActionChainResult
ActionContext
ActionProxyFactory
ActionSupport
DefaultActionInvocation
DefaultActionProxy
DefaultActionProxyFactory
ObjectFactory
TextProviderSupport
ValidationAwareSupport
Exceptions 
XworkException