7.2 Using a SAX DTD-Validating Parser

• The SAXParserFactory class provides the method
  • setValidating(boolean awareness)

  for requesting parsers that validate against DTDs.

• A validating parser would complain, if a DTD is not provided
• The LexicalHandler interface introduces the methods
  • startDTD(String name, String publicId, String systemId)
  • endDTD().
• The DeclHandler interface introduces the following methods
  • void attributeDecl(String eName, String aName, String type, String valueDefault, String value)
  • void elementDecl(String name, String model)
  • void externalEntityDecl(String name, String publicId, String systemId)
  • void internalEntityDecl(String name, String value)
• The DTDHandler interface introduces the following methods
  • void notationDecl(String name, String publicId, String systemId)
  • void unparsedEntityDecl(String name, String publicId, String systemId, String notationName)

The interface XMLReader introduces the method setProperty(String name, Object handler) for binding the implementations of the first two interfaces, through the following property names.

• http://xml.org/sax/properties/lexical-handler
• http://xml.org/sax/properties/declaration-handler

The interface XMLReader introduces the following method for registering the DTD handler.

• void setDTDHandler(DTDHandler handler)

An implementation of the above method on input

with a DTD file ‘sax-dtd.dtd’

may provide the following trace