element library{

 element book {
  attribute year {2004},
  element title {
   "Beginning XML, 3rd Edition"
   }
  },

 element book {
  attribute year {2003},
  element title {
   "Beginning Red Hat Linux 9"
   }
  },
 
 element book {
  attribute year {2003},
  element title {
   "Beginning ASP.NET 1.1 with VB.NET 2003"
   }
  }

}