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Sandra is working with an XML file containing product orders with the structure shown in the accompanying figure. She was just introduced to step patterns, and would like to incorporate them into the style sheet she is developing to display the orders data. She comes to you for help in developing expressions incorporating step patterns.
?Sandra would like to write an expression to show only those orders that have a preceding sibling containing the sameorderDate. Which of the following do you tell her is the correct expression?
A. ?orderDate=preceding::order/orderDate
B. ?not(orderDate=preceding::order/orderDate)
C. ?orderDate=ancestor::order/orderDate
D. ?not(orderDate=ancestor::order/orderDate)
Answer: A
Computer Science & Information Technology
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