Is it correct that the modelBaseVersion of the D2LogicalModel type, and targetClass attribute of other types, are defined in the schema so that they default to xs:anySimpleType?

For example:

 <xs:complexType name="D2LogicalModel">
  <xs:sequence>
    <xs:element name="exchange" type="D2LogicalModel:Exchange" />
     <xs:element name="payloadPublication" type="D2LogicalModel:PayloadPublication" minOccurs="0" />
     <xs:element name="d2LogicalModelExtension" type="D2LogicalModel:_ExtensionType" minOccurs="0" />
   </xs:sequence>
  <xs:attribute name="modelBaseVersion" use="required" fixed="2.0RC2" />
 </xs:complexType>

The lack of explcit type for the modelBaseVersion attribute causes it to default to xs:anySimpleType.

Wouldn’t this be more logical as xs:string? For example:

 <xs:complexType name="D2LogicalModel">
  <xs:sequence>
    <xs:element name="exchange" type="D2LogicalModel:Exchange" />
     <xs:element name="payloadPublication" type="D2LogicalModel:PayloadPublication" minOccurs="0" />
     <xs:element name="d2LogicalModelExtension" type="D2LogicalModel:_ExtensionType" minOccurs="0" />
   </xs:sequence>
  <xs:attribute name="modelBaseVersion" type="xs:string" use="required" fixed="2.0RC2" />
 </xs:complexType>

The same applies to the targetClass attribute:

 <xs:complexType name="_CatalogueVersionedReference">
  <xs:complexContent>
   <xs:extension base="D2LogicalModel:VersionedReference">
     <xs:attribute name="targetClass" use="required" fixed="Catalogue" />
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>