DOM editing validation

The example below adds DOM schema validation while modifying the in-memory DOM. It uses DOM load/save example as a basis.
We are adding a text node instead of a comment now, to generate a schema inconsistency.
The checking kicks off when you call normalizeDocument.
Also compare with the parsing validation example.

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// SimpleDOML3MemXSD.java   import com.sun.xml.internal.ws.developer.ValidationErrorHandler; import org.w3c.dom.*; import org.w3c.dom.bootstrap.DOMImplementationRegistry; import org.w3c.dom.ls.*;   import javax.xml.XMLConstants; import java.io.OutputStreamWriter;   public class SimpleDOML3MemXSD {     public static void main(String args[]) {     Document doc;     try {       // Create DOM Document using DOM Level 3 Load       DOMImplementationLS ls = (DOMImplementationLS) DOMImplementationRegistry.         newInstance().getDOMImplementation("LS");       LSParser builder = ls.createLSParser(         DOMImplementationLS.MODE_SYNCHRONOUS,         "http://www.w3.org/2001/XMLSchema");       doc = builder.parseURI(args[0]);       DOMConfiguration config = doc.getDomConfig();       // for DTD use XMLConstants.XML_DTD_NS_URI       config.setParameter("schema-type", XMLConstants.W3C_XML_SCHEMA_NS_URI);       config.setParameter("validate", true);       config.setParameter("error-handler", new StdErrorHandler());       //Obtain root elements       Element root = doc.getDocumentElement();         // Add text (NOT ALLOWED BY SCHEMA)       Text text = doc.createTextNode("Training text");       root.appendChild(text);         //Now validate       doc.normalizeDocument();        // Output to standard output; using DOM Level 3 save       LSOutput target = ls.createLSOutput();       target.setCharacterStream(new OutputStreamWriter(System.out));       ls.createLSSerializer().write(doc, target);     } catch (Exception e) {       System.out.println(e.getMessage());       e.printStackTrace();       System.exit(0);     }   }     private static class StdErrorHandler implements DOMErrorHandler {       public boolean handleError(DOMError e) {       String prefix = "Severity ";       if (e.getLocation().getLineNumber() != -1) {          prefix = "Line " + e.getLocation().getLineNumber()           + " column  " + e.getLocation().getColumnNumber()           + ", severity ";       }       System.err.println(         prefix + e.getSeverity()           + " issue: " + e.getMessage());       return true;     }   } }