The terms model, schema, and framework are synonymous. Each is an abstract representation of an entity that has a physical or logical existence. In CIM, a schema is a named collection of classes used for class naming and administration. Within a schema, classes and their subclasses are represented hierarchically using the following syntax: Schemaname_classname. Each class name in a schema must be unique. Solaris WBEM Services includes a Solaris Schema. It contains all classes specific to the Solaris extension to CIM.