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## Package javax.xml.transform.sax

This package implements SAX2-specific transformation APIs.

See:
Description

Interface Summary
TemplatesHandler | A SAX ContentHandler that may be used to process SAX parse events (parsing transformation instructions) into a Templates object.
TransformerHandler | A TransformerHandler listens for SAX ContentHandler parse events and transforms them to a Result.

Class Summary
SAXResult | Acts as an holder for a transformation Result.
SAXSource | Acts as an holder for SAX-style Source.
SAXTransformerFactory | This class extends TransformerFactory to provide SAX-specific factory methods.

## Package javax.xml.transform.sax Description

This package implements SAX2-specific transformation APIs. It provides classes which allow input from `ContentHandler` events, and also classes that produce org.xml.sax.ContentHandler events. It also provides methods to set the input source as an `XMLReader`, or to use a `InputSource` as the source. It also allows the creation of a `XMLFilter`, which enables transformations to "pull" from other transformations, and lets the transformer to be used polymorphically as an `XMLReader`.

The `SAXSource` class allows the setting of an `XMLReader` to be used for "pulling" parse events, and an `InputSource` that may be used to specify the SAX source.

The `SAXResult` class allows the setting of a `ContentHandler` to be the receiver of SAX2 events from the transformation.

The `SAXTransformerFactory` extends `TransformerFactory` to provide factory methods for creating `TemplatesHandler`, `TransformerHandler`, and `XMLReader` instances.

To obtain a `SAXTransformerFactory`, the caller must cast the `TransformerFactory` instance returned from `TransformerFactory.newInstance()`.

The `TransformerHandler` interface allows a transformation to be created from SAX2 parse events, which is a "push" model rather than the "pull" model that normally occurs for a transformation. Normal parse events are received through the `ContentHandler` interface, lexical events such as startCDATA and endCDATA are received through the `LexicalHandler` interface, and events that signal the start or end of disabling output escaping are received via `ContentHandler.processingInstruction(java.lang.String, java.lang.String)`, with the target parameter being `Result.PI_DISABLE_OUTPUT_ESCAPING` and `Result.PI_ENABLE_OUTPUT_ESCAPING`. If parameters, output properties, or other features need to be set on the Transformer handler, a `Transformer` reference will need to be obtained from `TransformerHandler.getTransformer()`, and the methods invoked from that reference.

The `TemplatesHandler` interface allows the creation of `Templates` objects from SAX2 parse events. Once the `ContentHandler` events are complete, the Templates object may be obtained from `TemplatesHandler.getTemplates()`. Note that `TemplatesHandler.setSystemId(java.lang.String)` should normally be called in order to establish a base system ID from which relative URLs may be resolved.

The `SAXTransformerFactory.newXMLFilter(javax.xml.transform.Source)` method allows the creation of a `XMLFilter`, which encapsulates the SAX2 notion of a "pull" transformation. The following illustrates several transformations chained together. Each filter points to a parent `XMLReader`, and the final transformation is caused by invoking `XMLReader.parse(org.xml.sax.InputSource)` on the final reader in the chain.

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.