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Message: [QUOTE="Bekkali Hicham, post: 767405"] Hi, i am using WSAD 4.0.2 java perspective to devellop a XMLEditor (read only), i use the SAX api for this purpose, everything works fine, i succed to create a JTree representation of an xml file, but when i choose to open a non-well-formed xml file,i receive the event DefaultHandler.fatalError(SAXParseException), but when i want to open an invalide-xml file (with an incorporated dtd) the parser don't send any information, evenif i have overide the DefaultHandler.error(SAXParseException), that last one is not called. i have made some search, and notice that parser.isValidating() return false, it means that the parser i use don't check the validity of an xml file, it checks only the well-formedness. How can resolve this probleme, have to use a tiers xml-parser (xerces), if yes how to install and use it ? is the parser delivred by ibm (trough WSAD product )is an "validating parser" or not? thanks for your help [/QUOTE]