Draft 9 Item 12: SchemaEntityRefType#objectClassName and #elementName.

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

Item #12 was not addressed.  The XSD still allows SchemaEntityRefType to 
contain both or to contain neither of objectclassname and elementname. 

Could the XSD require that an instance of SchemaEntityRefType have one 
attribute or the other (e.g., by expressing this as a choice)?

Also, please camel-case "objectClassName" and "elementName" (for 
consistency with other attribute names).

gpc

>     <complexType name="SchemaEntityRefType">
>         <complexContent>
>             <extension base="spml:ExtensibleType">    
>                 <sequence>
>                 </sequence>
>                 <attribute name="objectclassname" type="string" 
> use="optional" />
>                 <attribute name="elementname" type="QName" 
> use="optional" />
>             </extension>
>         </complexContent>
>     </complexType>