Trials with XPath

Illustrating various ways to make use of a single XPath expression
to extract data from an XML document.

The document is a list of names & marks (see here for details)
Target : various pieces of information about students whose mark is above a certain bound.

Typically, with file = NN.1.xml and bound = 15

jfp$ java TryXPath NN.1.xml 15

List of students having a mark above 15

अश्विन्

Đức

Hélène

One of the students (node) having a mark above 15

अश्विन्

One of the students (name) having a mark above 15

अश्विन्

Are there any students having a mark above 15 ?

Yes!

Average mark of students having a mark above 15

17.0

Thats'all folks!

jfp$

Here is the code TryXPath.java