primary
{
  namespace test
  {
    union u1 http://www.w3.org/2001/XMLSchema#int http://www.w3.org/2001/XMLSchema#string 
    union u2 
    {
      enumeration <anonymous>: http://www.w3.org/2001/XMLSchema#token
      {
        enumerator one
      }
    }

    {
      enumeration <anonymous>: http://www.w3.org/2001/XMLSchema#string
      {
        enumerator two
      }
    }

    union u3 http://www.w3.org/2001/XMLSchema#int test#u1 
    {
      enumeration <anonymous>: http://www.w3.org/2001/XMLSchema#token
      {
        enumerator one
      }
    }

    {
      enumeration <anonymous>: http://www.w3.org/2001/XMLSchema#string
      {
        enumerator two
      }
    }

  }
}