How to load XML to SWF on each node?
You would create a new node.tpl.php by copying the existing one from your theme or from the node module (part of core).  Rename your copy node--mycontenttype.tpl.php and place it in your theme directory (along side your other .tpl files).

Install devel and use dpm() to explore the $content variable.  Hide the XML field and extract it's file id (fid) and pass it to file_load.  This should return an object containing your file path, again use dpm() to explore this array and get your file.

https://api.drupal.org/api/drupal/includes%21file.inc/function/file_load/7

Embed your .swf directly into your new node.tpl.php and pass the XML to it as you would any other Flash argument.