DefaultHandler infoset extensions

• The DeclHandler and LexicalHandler extension handlers are not supported by the DefaultHandler convenience class.

• Solution:

  Define a new org.xml.sax.ext class implementing those two interfaces, inheriting from org.xml.sax.helpers.DefaultHandler

  public class DefaultHandler2 extends DefaultHandler 
    implements DeclHandler, LexicalHandler { 
    
      // LexicalHandler methods
      public void startDTD(String name, String publicId, String systemId)
        throws SAXException {}
      public void endDTD() throws SAXException {} 
      public void startEntity(String name) throws SAXException {}
      public void endEntity(String name) throws SAXException {}
      public void startCDATA() throws SAXException {}
      public void endCDATA() throws SAXException {}
      public void comment(char[] ch, int start, int length)
        throws SAXException {}
        
      // DeclHandler methods
      public void elementDecl(String name, String model)
        throws SAXException {}
      public void attributeDecl(String elementName,
        String attributeName, String type,
        String valueDefault, String value)
        throws SAXException {}
      public void internalEntityDecl(String name, String value)
        throws SAXException {}
      public void externalEntityDecl(String name, String publicID, 
        String systemID) throws SAXException {}
    
  }
  

• Alternately, update DefaultHandler.