Running Example

• Bookstore:

  • Non Uniform Hierarchy
  • sci-fi: 2 levels
  • mystery: 3 levels

• Customers: Flat Table

<books_and_customers><bookstore> <fiction> <sci-fi> <book> <isbn�</isbn> <title>Do androids dream of electric sheep</title> <author>Philip K. Dick</author> </book> </sci-fi> <fantasy> <mystery> <book> <isbn�</isbn> <title>The two towers</title> <author>JRR Tolkien</author> </book> </mystery> </fantasy> </fiction></bookstore><!-- continued next column -->

<customers>

<customer>

<name>Jason Woolsey</name>

<boughtbooks>

<isbn�</isbn>

<isbn�</isbn>

</boughtbooks>

</customer>

<customer>

<name>P.W. Ellis</name>

<boughtbooks>

<isbn�</isbn>

<isbn�</isbn>

</boughtbooks>

</customer>

</customers>

</ books_and_customers >

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