Manoj,
Since this thread is already answered and your inputs are not directly related to the original query, why not you start a discussion thread in this forum - make sure to uncheck the "mark this discussion as a question" so that it does not encourage those who are merely point hunting.
We can then have a proper conversation over there on that thread.
As a start you can possibly indicate what specifically you are trying to learn where SCN search have not helped you. You also probably should elaborate on what you mean by "trace an xml file" because I don't really understand that, as always if it can be backed by an example, it would be useful.
Rgds
Eng Swee