When creating an xml file using DBMS_XMLGEN the header of the created file is '<?xml version="1.0"?>'. But since the database I have to extract data from also contains characters like 'é' the following string should be included nin the header: 'encoding="ISO-8859-1"'. So the header should look like '<?xml version="1.0" encoding="ISO-8859-1"?>'. Is this possible using native PL/SQL functions?