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The relevant passage is: "Note: Because the validation of keyref (see clause 4.3) depends on finding appropriate entries in a element information item's ·node table·". "in a" should be "in an".
WG agrees that this is a typo. Thank you very much for the reading.
The error has been corrected in the current WG-internal status-quo draft of XSD 1.1. So I'm marking this bug resolved.