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The name of the argument is given as "b" but references are made to it under the label of "d" - such as "'0' when d = 0000". The error still exists in the Editor's Draft as of 3rd of June 2011.
WG agrees this needs to be fixed. Classified as 'editorial' since it's in a non-normative section.
The correction has been made in the member-accessible version of the status-quo document (https://www.w3.org/XML/Group/2004/06/xmlschema-2/datatypes.html), so I'm marking this issue as resolved. Thank you for reporting this error!