Most of what the 4Q1999 SOAP specifications did was simply illustrate how to model typed references and arrays in the W3C XML Schema type system. Period. We also had a model for adding optional and mandatory protocol headers (like CORBA's service contexts and DCOM's ORPCTHIS/THAT), but that was it. Frankly, had the schema specification been a full REC in 4Q1999, the SOAP specification would have at most 3-4 pages.
Does that answer anything?