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The normative text for sml:keyref (Section 3.5) must be updated to state that either the ref attribute or the refer attribute must be specified for a sml:keyref identity constraint. It is an error to specify both attributes or none of the attributes. This is related to Bug 4617 Opened in response to http://www.w3.org/2005/06/tracker/sml/users/41110
This bug depends on 4617 which is not marked for FPWD. Further, both bugs need more discussion.
added the following item in section 4.4 (Identity Constraints) - Either the ref attribute or the refer attribute (but not both) MUST be specified for an sml:keyref element.