From the web site:

StAX is a standard XML processing API that allows you to stream XML data from and to your application. This StAX implementation is the standard pull parser implementation for JSR-173 specification.

  http://stax.codehaus.org/

It is an alternative to the venerable [SAX] and is much more powerful and robust than TAX (see [TAX Revisited] for an upgraded version, [TAX: A Tiny API for XML] for the original).
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[Category XML]