The meta data information for a resource-ref element.
The resource-ref element contains a declaration of enterprise beanís
reference to an external resource. It consists of an optional description,
the resource manager connection factory reference name, the
indication of the resource manager connection factory type expected
by the enterprise bean code, the type of authentication (Application
or Container), and an optional specification of the shareability of
connections obtained from the resource (Shareable or Unshareable).
Used in: entity, message-driven, and session