 Map are of type String.
 
 <p>
 The entry syntax must also provide for the optional inclusion of information sufficient to define a
 RegistrationContext. This information would only be present when the factory will register the provider. For example,
 each entry could provide for the inclusion of one or more RegistrationContext objects of the following form:
 <ul>
   <li>The message layer name (or null)
   <li>The application context identifier (or null)
   <li>The registration description (or null)
 </ul>