ebXML is a modular suite of specifications that provide a standard method to exchange business messages, conduct trading relationships, communicate data in common terms and define and register business processes.
Governor says big vendors and analyst firms consider ebXML to be "dead," but counters with coverage that Ed Dodds provides to growing adoption of the standard around the globe: in healthcare (PDF file), automotive, and supply chains. (PDF file.)
In my own research with Evans Data, 39% of IT executives and managers reported that they were familiar with ebXML -- truly impressive compared with the low levels of awareness of other standards. About 10% of respondents reported they were already working with ebXML in some capacity.