An XML document exported from FrameMaker should not be missing an end-tag. Are you having trouble locating the erroneous "para" element or the XML file?
If the former, I suggest paring down your document to the shortest possible test case. If the latter, I gather from your subject line that your application uses XSLT. Is XSLT run when you export the document, when you import the result or both? In any case, you may need to compare pre- and post- versions of the XML document because the XSLT transform may have introduced the error.
--Lynne