Database Software

I have requirement like attaching the document dynamically to the workflow email notifications.
options)
a) i can pass url in workflow email notifications and attach the document in OAF Page or html page
b)if i have an option to attach directly to the email notification is not at all a problem.

either of the above options is fine.Please let me know if any one done this kind of requirement or anybody have new ideas on this

Basic concept is to attach the file in email notification dynamically that has to go and insert in sales order line attachments.