Never use an XML file exported via eXtyles that has parsing errors! You want to make sure that you've cleared all errors, and receive the "Congratulations, you file has successfully parsed!" message from eXtyles before you move an XML file into production. If your file has parsing errors, depending on what exactly is in your file, here are some things that will likely go wrong:

Special characters may not be correctly encoded, leading to display problems.

    Example: The surname Sacramento Rampão becomes

<surname>Sacramento Rampo</surname>

   instead of 

<surname>Sacramento Ramp&#x00E3;o</surname>

The XML file may be incomplete.

Certain types or errors can cause the XML export to stop at the point of the error, which may leave you with an XML file that does not contain all of the document's content.