The ﬁrst service description format for the Web appeared in 2001.The second didn't arrive until 2007. In 2010 there were less than ﬁve known service description formats. As of this writing there are more than a dozen. We’re experience a “Cambrian explosion” of
service description formats!
BONUS: link to Mike's notes on the presentation http://g.mamund.com/follow-v-hold
Why all these new formats? Is there something missing that each
new type tries to ﬁx? Or are these new formats just repeating the
same patterns over and over? This paper 1) explores two main
approaches to service description design (describing functionality
and describing things), 2) reviews key shortcomings of existing
approaches that lead to client applications tightly bound to a single
service instance, 3) offers up a new set of measures for useful service
description, and 4) introduces an alternative format that supports the
key Web principle of follow your nose.