DOM, XML Schema, Java. Confused!!!

Hi all,
Please help me to answer the 3 questions. I'm totally confused.
1. Does DOM allow us to add invalid data based on the XML schema?
2. I have an XML file. I want to use DOM to add, modify and delete nodes from the file, then print out an XML output file. If DOM does not prevent us from adding invalid data, I guess we have to run the validation after the output file is printed out?
3. There are so many parsers, DOM, ... outthere that I am totally confused. Please give me your suggestions. I want to use Java to populate the DOM tree, check the data integrity based on the XML schema as I modify the DOM tree (if possible) or after printing the XML output to a file. What parser should I use? What DOM should I use (DOM or JDOM)? Can I use MS XML parser (because that what my main client uses), DOM, and Java? If so what do I need. I have read 2 books and many sites, but still don't have the answer clear yet.
Very appreciate your help,
Nam.

1.
never tried with Schema, with DTD: yes
2.
it is what I did*, which is pretty clumsy: currently AmauryDebou has started another thread on this subject but there's no answer yet.
*in fact I do everything in RAM (no file needed): I ouptut the DOM in a byte array and then reparse it
3.
Xalan/Xerces is pretty standard (they are used in JAXP).
JDOM has a reputation of being faster than DOM - depends on the amount of data you deal with.
if you develop in Java, forget MSXML
if parsing speed is an issue, you can achieve excellent performances with James Clark's XP.

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DOM, XML Schema, Java. Confused!!!

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