Transform varying input types to XML in JAVA

[chetan.33]

Hi All,

I am looking for means to efficiently convert inputs in varying format
-- say CSV, Excel file to XML format. I have with me the metadata of
the data for input files AND the XSD for the target XML.

I have already considered XSLT as one of the approach - which as per my
understanding supports exactly reverse scenario of what i need - viz.
transform XML to any format.

Looking for solutions which involve usage of widely supported Open
Source APis.
Thanks in advance