[Attribute Name] SERVICE [Type] String [#] 0 or 1 [Description] 
Specifies a service to invoke with the results of an output binding. Aside from the obvious benefit of chaining services to further automate the tasks that can be encapsulated for client programs, there are many cases when target documents can only be retrieved after visiting several Web pages in succession. In some instances cookies are issued by an entry page that must be visited prior to interacting with HTML forms; in others, URLs are dynamically generated from databases for specific user identities.