Scripts with Saxon

I need to do some processing of data in an XML file.
The data is an image stored as HEX - i.e. every byte
is encoded as 2 hexadecimal digits.

With a little help (actually a lot) from this list
I have outputted the data to a file which is processed
afterwards with a C-program.

Now I would like to know if it's possible to accomplish
this processing within a stylesheet.

I've been told that this is possible with MSXML
 1 Is that true?
 2 Can it be done with Saxon?

/Håkan
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