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But when you need to modify an XML structure - especially when you need to modify it interactively - an in-memory structure makes more sense. However, although DOM provides many powerful capabilities for large-scale documents (like books and articles), it also requires a lot of complex coding.

The details of that process are highlighted in When to Use DOM in the next chapter.

So if the application does not generate an exception, then the default error-event handler generates one.

But for nonfatal errors and warnings, exceptions are never generated by the default error handler, and no messages are displayed.

The following code handles the start-document and end-document events: public class SAXLocal Name Count extends Default Handler { private Hashtable tags; public void start Document() throws SAXException [...] public void end Document() throws SAXException private static String convert To File URL(String filename) { [...] method is invoked, to get the names and counts of the elements contained in the hash table, and print out a message onscreen to tell the user how many incidences of each element were found.

Interface Handling Content Events Document Events Element Events Character Events Handling Special Characters Setting up the Parser Setting up Error Handling Handling Non Fatal Errors Handling Warnings Running the SAX Parser Example without Validation To Run the Example without Validation Implementing SAX Validation Choosing the Parser Implementation Using the Validating Parser Ignorable White Space Configuring the Factory Validating with XML Schema Setting the SAX Parser Properties Associating a Document with a Schema Error Handling in the Validating Parser DTD Warnings Running the SAX Parser Examples with Validation Experimenting with DTD Validation Errors Experimenting with Schema Validation Errors Handling Lexical Events How the This chapter focuses on the Simple API for XML (SAX), an event-driven, serial-access mechanism for accessing XML documents.

This protocol is frequently used by servlets and network-oriented programs that need to transmit and receive XML documents, because it is the fastest and least memory-intensive mechanism that is currently available for dealing with XML documents, other than the Streaming API for XML (St AX).

For a more detailed comparison, see When to Use SAX.

Setting up a program to use SAX requires a bit more work than setting up to use the Document Object Model (DOM).

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