5.3. Example: A Checkbook

Let's flex our muscles and use what we know so far to design a DTD for a checkbook application. Example 5.1 illustrates how such a document might look.

Example 5.1. A Sample Checkbook Document
<?xml version="1.0"?>
<!DOCTYPE checkbook SYSTEM "checkbook.dtd">

<checkbook>

  <deposit type="direct-deposit">
    <payor>Bob's Bolts</payor>
    <amount>987.32</amount>
    <date>21-6-00</date>
    <description category="income">Paycheck</description>
  </deposit>

  <payment type="check" label="980">
    <payee>Kimora's Sports Equipment</payee>
    <amount>132.77</amount>
    <date>23-6-00</date>
    <description category="entertainment">Kendo equipment</description>
  </payment>

  <payment type="atm">
    <amount>40.00</amount>
    <date>24-6-00</date>
    <description category="cash">Pocket money</description>
  </payment>

  <payment type="debit">
    <payee>Lone Star Cafe</payee>
    <amount>36.86</amount>
    <date>26-6-00</date>
    <description category="food">Lunch with Greg</description>
  </payment>

  <payment type="check" label="981">
    <payee>Wild Oats Market</payee>
    <amount>47.28</amount>
    <date>29-6-00</date>
    <description category="food">Groceries</description>
  </payment>

  <payment type="debit">
    <payee>Barnes and Noble</payee>
    <amount>58.79</amount>
    <date>30-6-00</date>
    <description category="work">O'Reilly Books</description>
  </payment>

</checkbook>

Taking a glance at this sample, what can you say about the document type? The root element is <checkbook>. It contains a series of entries, each of which is a <payment> or a <deposit> ...

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