I am looking for a solution or idea of merging xml schema files (.xsd) into one xsd file according to my boss request. What technology do I need to use? Plain java class or xslt? Any suggestion? Because I am a new java programmer, could you give me detail info as more as possible? Thanks a lot in advance!!

I can't see why this should need Java.

Why are you merging the files into one, what are the expected benefits?

Do the different schema documents use the same target namespace or different target namespaces? If the same, then they can be logically combined using <xsd:include>, there's no need to combine them physically. If different, then the only way to combine them is with <xsd:import>.

But if you do want to combine the files physically, then you could use XSLT. Or a text editor.

Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference