code: public void unmap(final RestletUtilUser user, final Role role)
      {
          this.unmap(role, SesameRealmConstants.OAS_ROLEMAPPEDUSER, user.getIdentifier());
      }
docs: Unmaps a user defined in a component from a role defined in the application.
  
  @param user
  The source user.
  @param role
  The target role.