Release Notes: This release features minor to huge performance increases throughout the core libraries (XML parsing, XSLT stylesheet reading, and XPath evaluation are remarkably faster). All dependencies on PyExpat are gone. XML_CATALOG_FILES env var support was added. Security risk XPath extension functions are now disabled by default. XLink, XUpdate, and RDFS support was improved. Berkeley DB (bsddb) drivers were added. MySQL drivers were optimized. There are many more bugfixes and enhancements.