The JSR173 is the XML pull API used at build time for the Saxon-B
XSLT processor: it has become part of OpenJDK 6.

When using an older JDK, you can get the API from
    http://dist.codehaus.org/stax/jars/
located at the StAX Home site
    http://stax.codehaus.org/
and put it under stax/download.

1.2 Release(final) is available under the Apache License 2.0.

Checksum (for reference):
MD5 (stax-1.2.0.jar) = aa3439d235f7d999532b66bac56c1f87