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The information made available through DAF interfaces can be described by one or more schema. At least some agreement on schema
must exist between a data provider and a client before effective communication is possible.
In particular, every operation on ResourceQueryService requires the ResourceIDs of some properties. Moreover, the results
of a query are meaningful only to the extent that the client and data provider agree on the definition of these properties.
Therefore, this specification provides:
• A standard schema for EMS applications, generated from the EPRI CIM [3].
• Provision for additional industry and application-specific schema, and revisions of the EPRI CIM.
• A means to extend standard schema or merge custom and standard schema without conflicts.
• A means to manage multiple versions of a schema.
• A means for the data provider to support a subset of a schema, and for the client to discover which parts are supported.
• A standard schema, taken from [2], for querying other schema.