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The intro to Appendix E says that the example schema document contain currently enrolled students, active courses etc. In fact, the schema documents contain type definitions for these. Presumably the xml files that use the schema define the currently enrolled students, etc. The wording needs to be fixed so that it is accurate.
Paragraph 1 in Appendix E now reads: ---------- The following example will be used to illustrate the sml:key, sml:unique, and sml:keyref constraints across SML references. This example consists of three schema documents. university.xsd contains the type definitions for a University element, a Student SML reference and a Course SML reference. students.xsd contains the type definitions for an EnrolledCourse SML reference and a Student element. courses.xsd contains the type definition for a Course element.