Why Do I Need SAX?
If you have an XML document, at some point you will need to read it
programmatically. Let’s say you want to pull out the text from a document or
maybe look for attributes of specific tags. You might be able to do some of the
work using a tool or maybe XSLT, but these solutions have their limitations.
When you need to do something more complex, you’ll have to write a program.
That’s where SAX comes in.
If you are writing a tool or a standalone program to process XML, SAX is
a good way to do it. Many applications today can be customized using an XML
file. These files have replaced the traditional “properties” files for reasons
of uniformity and richness of expression. Instead of spending a lot of your
time writing a parser to read XML files, you might as well use SAX. As
mentioned earlier, SAX is completely free, so it can be embedded in a larger
application without royalty fees or even copyright notices.
Some SAX parsers can validate a document against a Document Type
Definition (DTD). Validating parsers can also tell you specifically where
validation has failed. You will see an example demonstrating how to do that in