One of the most basic XML parsing tasks in web applications is reformatting XML data for display on a web page - basically using it as a markup language.For such chores, silently ignoring an invalid element is a minor problem. A JAXP implementation could legally use a DOM parser in this case, but there is no reason to. Set Error Handler() as in the example in this SO question stackoverflow.com/questions/4864681/…? Sun's JDK 6 uses SAX parser with a Stream Source.If you use a DOM parser explicitly for validation, you will definitely instantiate a DOM tree. Is is a case of just creating the Error Handler and associating it with the validator? // parse an XML document into a DOM tree Document Builder parser = Document Builder Instance()Document Builder(); Document document = parser.parse(new File("instance.xml")); // create a Schema Factory capable of understanding WXS schemas Schema Factory factory = Schema Instance(XMLConstants. If I use an Error Handler (own class that implements Error Handler) instead, it recognizes all errors, but the try-catch-block of validator.validate does not throw any Exception..W3C_XML_SCHEMA_NS_URI); // load a WXS schema, represented by a Schema instance Source schema File = new Stream Source(new File("my Schema.xsd")); Schema schema = Schema(schema File); // create a Validator instance, which can be used to validate an instance document Validator validator = Validator(); // validate the DOM tree try catch (SAXException e) Working this way, a SAXException would be thrown at the first error in the xml-file and stops then the validation. How do I recognize an error in the class that invokes the validate-method of my validator? is probably a network location, so it'll go out and hit the network with each and every validation, not always optimal.
They provide a means for defining the structure, content and semantics of XML documents. XML Schema 1.0 was approved as a W3C Recommendation on and a second edition incorporating many errata was published on 28 October 2004; see reference list for pointers.
Once you have saved the XML it is possible to use the virt-xml-validate command to check for usage problems: If there are no errors then your description is well-formed from an XML point of view and matches the libvirt schema.
The schema cannot catch all constraints, but fixing any reported errors will get you further along.
You get a missing or garbled row of data in output that's being read by a human, who can figure out what it should say, or ignore it, or even get the data from another source if it's the bit they're looking for.
If that describes your application, you might consider using package, which has less complicated combinators.