I came across following good links that you may find useful if you want to learn the art and science of XPath query.
1- Understanding XPath at Queue Publishing
Hammad’s Reflections On Technology
… Cloud, Identity, Security, Compliance and other Geeky adventures….
thnanks for the links. I wanted to make use of XPATH in the AddressBook project, but didn’t(coz i already had the whole xml deserialized). Anyways i am looking forward to learn how to query xml documents.