Dennis @ PerfectForms
PerfectForms allows you to integrate with other data sources in several ways including with our Connection Agent for databases and directories, and our APIs for web services. The data export to XML or CSV supports an export of all form data to an external file in the PerfectForms schema. It does not allow for exporting of individual instance data. It sounds like your needs will be better suited with a data integration different than an XML export. I can contact you to discuss the details if you would like.