If set to true, this service will run under a special process that is isolated from the rest of the system. The only communication with it is through the Service API (binding and starting).

Must be a boolean value, either "true" or "false".

This may also be a reference to a resource (in the form "@[package:]type:name") or theme attribute (in the form "?[package:][type:]name") containing a value of this type.

[Android Documentation]