LIBVERSION_SCRIPT_EXAMPLE_1.0 {
  global:
    test1;  # mytag
    extern "C++" {
      Test3::*;  # mytag
    };
  local:
    *;
};

LIBVERSION_SCRIPT_EXAMPLE_PRIVATE {
  global:
    test2;
    extern "C++" {
      Test4::*;
    };
} LIBVERSION_SCRIPT_EXAMPLE_1.0;