Fabrizio: I'm not a specialist in Tika, but XMP files are plain XML, and pretty well standardised, so you probably wouldn't need Tika to read these. Just use any old XML parser (from JDKs standard library, Saxon …) and filter out the values you need. I don't know if the Tika team agree, but I see Tika as a tool to extract information from binary data primarily.
Cheers John
