XPath: Navigating XML with XPath 1.0 and 2.0 Kick Start

Chapter 11. XPath 2.0 Boolean, QName, and Date Functions

IN THIS CHAPTER

• Boolean Functions

• Functions That Work with Dates and Times

• Functions That Extract Data from Date/Time Values

• Functions That Adjust Time Zones

• Subtracting xs:dateTime Values

• Functions That Work With QNames

• In Brief

Boolean Functions

As you know, there are no explicit values named true and false that you can embed in XPath 2.0 expressions. Instead, if you need a true or false value, you use the Boolean constructor functions fn:true and fn:false. In addition, the fn:not function flips the logical value of its argument. Here are the Boolean functions in overview:

• fn:true returns the xs:boolean value true.

• fn:false returns the xs:boolean value false.

• fn:not flips the Boolean value of its ...