Errata on Timestamp ValueType

Lines 1290-1294 of WSS 1.0 state:
"This specification defines and illustrates time references in terms of 
the xsd:dateTime type defined in XML Schema. It is RECOMMENDED that all 
time references use this type. 
<snip/>
If, however, other time types are used, then the ValueType attribute 
(described below) MUST be specified to indicate the data type of the time 
format."

The ValueType attribute IS NOT described anywhere after this paragraph. 
The schema does not even define it, therefore it is unclear whether this 
should be a URI, QName, or something else. 

Some vendors are including a ValueType with timestamps as in:
   <wsu:Created 
ValueType="xsd:dateTime">2004-08-27T17:08:04Z</wsu:Created>
and others:
   <wsu:Created 
ValueType="http://www.w3.org/2001/XMLSchema/dateTime">2004-08-27T17:08:04Z</wsu:Created>
and the rest (not at all):
   <wsu:Created>2004-08-27T17:08:04Z</wsu:Created>

Please add a table indicating the correct value and format.

Thanks,
Mike