Disclaimer: This entry contains about a dozen acronyms and may make non-techies cross-eyed.
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One of the nice things about designing a new system is that you get to use the latest and greatest toys (err, tools). 😀 It has been mentioned before that the use of XML in Evergreen is pretty pervasive. We make use of MARC21Slim and MODS for bibliographic data, XMPP for Jabber messaging, XUL for widget layout, XHMTL for OPAC, and we even subclass LibXML for some internal domain objects.