Integration

Hi,

I am trying to develop a process that delivers files after reading data from a database.
However, it is required not to deliver the data immediately. We want to perform some checks before the files get written.

So the way we want to design this is,

1. Read data from database (or any other input). The data is in XML format (this is a requirement, as in general, we have xml data)
2. This data is written, opaquely, to a JMS queue that can store binary data, along with what is the filename of the file that would be written (filename is passed using JMS Headers)
3. When required, another process reads the JMS queue's binary data, and dumps into a file

The reason I want to use opaque data while inserting in the JMS queue is, that enables me to develop a single process in Step 3 that can write any file, irrespective of the format.

My questions are
1. How to convert the xml data to opaque data. In BPEL I may use a embedded java, but how about ESB. Any other way....?
2. how to pass filename to the jms queue, when payload is opaque. Can I use a header attribute...custom attributes?
3. Which jms message type is better for this kind of requirement - SYS.AQ$_JMS_BYTES_MESSAGE or SYS.AQ$_JMS_STREAM_MESSAGE