Validating sax parser call first

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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.Other command line arguments in this part of the code will be examined later in this chapter, when we start looking at validation. Characters found within the element are passed as an array of characters, along with the number of characters (length) and an offset into the array that points to the first character.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.For simpler applications, that complexity may well be unnecessary.

When a fatal error occurs, the parser cannot continue.Both of these public void start Document() throws SAXException public void start Element(String namespace URI, String local Name, String q Name, Attributes atts) throws SAXException public void end Document() throws SAXException method defined in Setting Up I/O.You could start using your parser now, but it is safer to implement some error handling.So it is easy to vary the way you process text (for example), because you can process it multiple places in the program (for more detail, see Further Information).SAX requires much less memory than DOM, because SAX does not construct an internal representation (tree structure) of the XML data, as a DOM does.

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