In a place like Hong Kong where conference fatigue can be a very real malady, organisers know theyre onto a winning topic when they can pack a theatre with around 500 eager participants for a morning seminar. What you might find surprising is that Sun Microsystems managed to pull these numbers for a seminar on XML, a topic considered by many to be rather unsexy. XML, for the uninitiated, stands for eXtensible Mark-up Language and is a meta-language for describing data shared between applications.