(Q3) Find captions of figures that are referenced by <figref> elements in the chapter of "zoo.xml" with title "Frogs".

document("zoo.xml")/chapter[title = "Frogs"]
   //figref/@refid->fig/caption

• Introduces the "dereference" operator, a substitute syntax for XPath's id() function
• Includes an implicit name test, unlike the id() function