slide 13

XPath 2.0 is Still an “Expression Language”

• When you write XPath 2.0, what you write is an expression
  • (7 * 6) is an expression
  • /PLAY/ACT/SCENE is another kind of expression (a location path)
• An expression is evaluated to produce an object
  • (7 * 6) returns 42
  • A location path returns a sequence (list) of nodes
  • "XPath" = "difficult" returns false
  • distinct-values((4,5,6,7,6,5,4)) returns a sequence (4,5,6,7)
• There is an XPath 2.0 subset for pattern matching used in XSLT 2.0.