W3C XML Query WG - slide "XQuery Path Expressions"

Based on abbreviated syntax of XPath 1.0
- (Q1) In the second chapter of the document named "zoo.xml", find the figure(s) with caption “Tree Frogs”.
```
document("zoo.xml")/chapter[2]//figure[caption = "Tree Frogs"]
```
Extended with:
- a new dereference operator
- a range predicate
- (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
```