You'll notice that the SML WG has published a new specification together with a new version of the SML specification. This specification - called SML Interchange Format (SML IF) - defines a single XML document that can be used to exchange SML models across SML validators or between other consumers of SML models. A quick recap: An SML model is a set of XML documents - XML Schema documents that may use SML extensions, Schematron documents containing rules, and XML instance documents. The SML IF specification defines how all of these documents can be packaged in a single SML IF document without any loss of fidelity. The SML IF specification enables interoperability between different implementations of SML since all conforming implementations must be able to produce and consume SML IF documents. Note that there is no requirement that a model in SML IF document is complete or valid - incomplete/invalid models are allowed to enable scenarios where a producer sends an incomplete model to a consumer so that the consumer can integrate this model with some other model(s) to produce a complete model.
Configuration Management Database Federation (CMDBF) is an important scenario for the use of SML IF. Microsoft has announced its participation in the multi-vendor CMDBF WG and also announced the private beta of the Service Desk product. The CMDB in Microsoft's Service Desk is an SML validator with a persistent store for the models. The use of SML allows the Service Desk CMDB to define the structure of various configuration items, their relationships, and the policies/constraints that govern the desired state of these configuration items. The use of SML IF will enable rich interchange of configuration item data between two (or more) CMDBs since the SML IF will enable the exchange of relationships and policies/constraints in addition to the structure/data of the configuration items.
BTW, all test cases for the interop workshop are expressed as SML IF documents. So you have several examples of IF documents to help you ramp up on the specification.