Advanced Database

Exercise 1: Answer the following questions about OODB: a) b) c) Discuss the concept of information hiding in OODB. Give examples of inheritance, multiple inheritance, and selective inheritance? What is the difference between persistent and transient objects? Exercise 2: Write the following XPath queries on the "inventory.xml to return: a) All editors elements in the document. b) The author(s) of the third book element c) All book elements whose style attribute value is equal to the textbook value. d) All award elements that belong to book elements. e) All title elements one or more levels deep in the bookstore> element. f) All price elements elements of the magazine elements. All author elements of books whose prices is greater than 50. h) All book elements with style attributes. i) All author(s) of books that do not have a publisher element inventory.xml Joe Bob Trenton Literary Review Honorable Mention 12 Springer Mary Bob Selected Short Stories Britney Bob 55 2.50 Toni Bob B.A. Ph.D. Pulitzer Still in Trenton 6.50

It was a dark and stormy night.

But then all nights in Trenton seem dark and stormy to someone who has gone through what I have.

Trenton misery Robert Bob