read webservice filename tag & pull the file from file location

Hi,

PI system has exposed a web service out of the following structure for the outside party to call

<MAT>

<doc type>pdf</doc type

<subnumber>1234</subnumber>

<id>45ABC<id>

<matno>ABCD</matno>

<filename>transaction1.pdf</filename>

</MAT>

When the outside party submits a web service request, I have to read the <filename> value (transaction1.pdf) and get the file from the file location which is local and convert the file to byte array.

How do I do this in message mapping or java mapping? Any help is greatly appreciated

thx

mike