More data

type Reviews  =  reviews [
                   book [ 
                     title  [ String ],
                     review [ String ]
                   ]{0,*}
                 ]
let review0 : Reviews = 
  reviews [
    book [
      title  [ "XML Query" ], 
      review [ "A darn fine book." ] 
    ],
    book [
      title  [ "Data on the Web" ],
      review [ "This is great!" ] 
    ]
  ]