I posted a similar message to this one about 3 months ago. I had to work on other projects and also learn more about the process to make this happen. In a nutshell, here's what I'm trying to accomplish:
Does this sound like the way it should be done? If so, could someone with experience in doing this provide me with a rough sketch of the sorts of necessary components that will come into play so that I can create a list of things to learn? At this point, what I DO know is that the form will submit its information in XML format and be read by a PHP script. That's about it.
If it satisfies the requirements then it makes sense. ;^)
I have not done PHP development but I am guessing you will need at least:
1) a PDF library for PHP to do data import/export
2) an XML library for parsing http://www.php.net/manual/en/refs.xml.php
3) and a MySQL database driver http://dev.mysql.com/downloads/connector/php-mysqlnd/