[rules-users] drools 5.0 .drl as an xml file

Hi I am a newbie to drools. I would like to convert an existing .drl file in drools2.0 format to drools5.0 format. The existing file name is exmpldrools2.0.drl but it is in xml format. But when i just convert the contents of it to drools5.0 xml format and try to save it as exmpldrools5.0.drl and try to load the .drl file using knowledgebuilder i get the error, "[ERR 101] Line 1:0 no viable alternative at input '<' " . It throws error in the first line which is <?xml version="1.0" encoding="UTF-8"?>. Please help me solve this problem. How do i use xml files instead of .drl files and load the rules? thanks ABRA