The  
LexicalHandler interface reports:
Comments
CDATA sections
Document type declaration
Entities
An optional extension that not all parsers support
To set the LexicalHandler for a parser, 
set the 
"http://xml.org/sax/handlers/LexicalHandler" property. 
A SAXNotRecognizedException or SAXNotSupportedException will be thrown if the parser
doesn't report lexical events