when u find out an error "[xX][mM][lL]" is not allowed

when you find out an error look like this
"The processing instruction target matching "[xX][mM][lL]" is not allowed."
at parsing xml document.

this error identified that your xml document header is wrong.
you can fixing the error puting the xml header on the first row a xml document
without space or tab character on the left of the xml header.