Tutorials : Writing SAX Filters :

Writing SAX Filters

Pretty much everybody knows that a filter is kind of like a backup vocalist—it helps the main singer to become a star. SAX filters are used in XML document processing and can help amp up your SAX parsing. To extend the previous metaphor, the SAX filter is the backup singer for the SAX parser. XML Documents are the song. You can write SAX filters to:

Modify an XML document while it is parsed.

Validate the information stored in an XML doc and verify if it corresponds to application demands

Monitor the serialization of an XML doc

Control the parsing process

in this article, you'll learn how to create a SAX filter from scratch using the XMLFilter and XMLFilterImpl classes. You'll also learn how to modify and validate an XML document using two different filters. In the end, you'll put these two filters in a filters chain. The presented applications can function as a starting point for your understanding of a SAX filters' inner workings. All you have to do is to read carefully, and of course, to be familiar with SAX parsing facility.

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