The disadvantage sometimes of using DOM is that it uses to much resources in the sense of CPU and memory and for really huge files this method simply will not work in terms of performance. Parsing an XML document with DOM acquires the whole document to be loaded into memory before processing can be started. Via SAX only a small memory footprint is needed.
I once started this website because of the steep learning curve regarding XMLDB functionality. After one year of existence the following posts were written by mean , for me as a notepad to remember what I have learned and or checked, tested or figured out and to pass it on to all those who are interested in XMLDB functionality as well.
I hope these posts, this list provided here, will be of help, to make those first steps or help designing a working and performing XMLDB environment. There is still a lot to describe and learn and hopefully I have time to cover these in the second year to come.