Hi, We've had a discussion during last OCCI-wg session in Roma about the way to specify entity ids. As specified in current documents, entity ids can be specified in different ways _at the same time_ at creation time and implementations behaviour is not specified. I suppose we should consider either removing different ways to specify ids either specify implementation behaviour. Here are the different ways the can be specified: * JSON rendering: * 'id' attribute in JSON document * 'occi.core.id' attribute in the 'attributes' property of the JSON document * HTTP protocol: * PUT request: url of the request + rendering specific (see above) * POST request: rendering specific In general, for renderings where core attributes are rendered differently from others (id, source, target, etc), it is not specified how to deal with attributes being set twice. A suggestion will follow in a next e-mail. For me, the most important being to avoid ambiguities as to improve implementations interoperability. Regards, -- Jean Parpaillon -- Open Source Consultant Director @ OW2 Consortium OCCIware Strategic Orientation Committee Chairman Research Engineer @ Inria -- Phone: +33 6 30 10 92 86 im: jean.parpaillon@gmail.com skype: jean.parpaillon linkedin: http://www.linkedin.com/in/jeanparpaillon/en