Dear all, Jean has recently proposed the formalization of the core model as an XSD schema. This is useful as a clean description of the model, and makes possible to validate the specialization of this model to represent more specific models. We have two examples for this: infrastructure and monitoring described as compliant XML files. I considered another use of XML for the representation of an *instance* of a system (a monitoring system in my case). This kind of representation has two relevant functions: one is that it gives the ability to check certain requirements (e.g., that required attributes are present), the other is that it can drive the activity of the cloud management system. My question: is this related with the OCCI roadmap? To go to the attached XML, it is a representation of the example given in the document (the figure is also attached). Some relevant options I use: -) Mixins are represented as distinct stanzas in the XML document. -) Links are defined "inline", inside the origin resource Of course, it is possible to write an XSD, but I'd like to collect opinions about the overall approach. Comments? -- Augusto Ciuffoletti Dipartimento di Informatica Università di Pisa 56100 - Pisa (Italy)