primary
{
  namespace test
  {
    complex type
    {
      optional attribute foo2 http://www.w3.org/2001/XMLSchema#string
      required attribute bar2 http://www.w3.org/2001/XMLSchema#string
      optional attribute foo3 http://www.w3.org/2001/XMLSchema#string
      required attribute bar3 http://www.w3.org/2001/XMLSchema#string
    }
    attribute foo2 http://www.w3.org/2001/XMLSchema#string
    attribute bar2 http://www.w3.org/2001/XMLSchema#string
    attribute foo3 http://www.w3.org/2001/XMLSchema#string
    attribute bar3 http://www.w3.org/2001/XMLSchema#string
  }
}