XSD 28 fixes all open issues.

[Gary P Cole <Gary.P.Cole@Sun.COM>]

As of today, I am aware of no open issue with the XSD.  Version 28 fixes 
every issue I was tracking against version 27.
(1-114 CLOSED.)

|115. (Default cardinality) UpdatesResponseType#iterator minOccurs=1, maxOccurs=1 
|20050816 - Draft 27.
|20050816 - UpdatesResponseType#iterator should be minOccurs=0.
|20050827 - Fixed in Draft 28.

(116-120 CLOSED.)

|121. Updates should use <element ref="spmlsearch:query"/> 
|     (rather than <element name="query" type="spmlsearch:SearchQueryType".../>).
|20050827 - Fixed in Draft 28.

|122. Add "capabilityURI" attribute to CapabilityDataType.
|20050818 - AGREED. Must match "namespaceURI" of supported <capability>.
|20050827 - Fixed in Draft 28.

|123. ReferenceType should extend ExtensibleType (not CapabilityDataType).
|20050818 - AGREED. Each <capabilityData> is a wrapper.
|20050827 - Fixed in Draft 28.

|123. Annotate CapabilityDataType: capability specifies open content.
|20050827 - Fixed in Draft 28.

|124. Remove <capabilityData> sub-element from RequestType.
|20050827 - Fixed in Draft 28.

|125. Remove <capabilityData> sub-element from ResponseType.
|20050827 - Fixed in Draft 28.

|126. Should each capability-specific data item type extend a base type?
|20050818 - AGREED. Each <capabilityData> is of CapabilityDataType.
|20050827 - CLOSED.