Question 6 - DTD and XML
------------------------

Writing DTD will not be required on the exams of 2009-2011
but writing XML with or without DTD is likely to appear in exam
questions. In the excercise class we looked att the official solution
of the exam problem and discovered som errors. I have corrected two errors,
there may be more so look out!

[DOCTYPE ShoppingCart[
<!ELEMENT ShoppingCart (Shopper, Book*, DVD*, Clothing*)>
<!ATTLIST ShoppingCart totalPrice #REQUIRED>
<!ATTLIST ShoppingCart totalDiscount #REQUIRED>
<!ATTLIST ShoppingCart itemCount #REQUIRED>
<!ATTLIST ShoppingCart dvdMember (TRUE|FALSE) "FALSE">
<!ATTLIST ShoppingCart bookMember (TRUE|FALSE) "FALSE">
<!ATTLIST ShoppingCart clothingMember (TRUE|FALSE) "FALSE">
<!ELEMENT Book (Title, Author+)>
<!ELEMENT Title (#PCDATA)>
<!ELEMENT Author (#PCDATA)>
<!ATTLIST Book Price #REQUIRED>
<!ATTLIST Book DiscountOnPrice #REQUIRED>
<!ATTLIST Book Quantity #REQUIRED>
<!ELEMENT DVD (Title,Artist+)>
<!ELEMENT Title(#PCDATA)>
<!ELEMENT Artist(#PCDATA)>
<!ATTLIST DVD Price #REQUIRED>
<!ATTLIST DVD DiscountOnPrice #REQUIRED>
<!ATTLIST DVD Quantity #REQUIRED>
<!ELEMENT Clothing (Style,Size,Description)
<!ELEMENT Style (#PCDATA|MensClothing|WomensClothing|
     ChildrensClothing)*>
<!ELEMENT Size (#PCDATA|XS|S|M|L|XL)*>
<!ELEMENT Description (#PCDATA)>
<!ATTLIST Clothing Price #REQUIRED>
<!ATTLIST Clothing DiscountOnPrice #REQUIRED>
<!ATTLIST Clothing Quantity  #REQUIRED>
]>


Obviously, there are many correct answers to this problem.

<?xml version = "1.0" encoding = "UTF-8"?>
<ShoppingCart totalPrice = "32.50" totalDiscount = "7.50"
 itemCount = "2" dvdMember = "TRUE" bookMember = "TRUE"
 clothingMember = "FALSE">
    <Shopper id = "33118">
      <Name>Donald Duck</Name>
    </Shopper>
    <Book Price = "26.50" DiscountOnPrice="6.0">
      <Title>The Devil in Dover</Title>
      <Author>Lauri Lebo</Author>
    </Book>
    <DVD Price = "8.50" DiscountOnPrice = "1.50">
      <Title>Sleepless in Seattle</Title>
      <Artist>Meg Ryan</Artist>
      <Artist>Tom Hanks</Artist>
    </DVD>
</ShoppingCart>