[Pharo-users] XMLWriter Class

I have asked about this earlier. I am using the XML library and in XML-Parser-Nodes there is a method printOn printOn: aStream (XMLWriter on: aStream) writeWith: [:writer | self writeXMLOn: writer]. Since I didn't have XMLWriter I thought it would be inside the XML-Writer package but apparently it is not. Can I know what package has this class? Or if there is anyway to solve this problem? Thanks again :)