In preparation for the upcoming launch of Groove Web Services, we’ve made our wsdl and xsd files available on our public server. This will give those of you who are eager to start looking at the product a chance to see how our APIs are designed. You can now read all about it on the Groove DevZone. (Note the new Groove Web Services section there).
Read the rest of his blog entry for the gory (geeky) details.