Strip processing instruction declaration

the following error message occure every time try to submite xquery usining
saxon 7.9
the program is client server application impleminting using java

thanks





[Fatal Error] :7:6: The processing instruction target matching
"[xX][mM][lL]" is
 not allowed.
Parsing failure: org.xml.sax.SAXParseException: The processing instruction
targe
t matching "[xX][mM][lL]" is not allowed.