Should `classRef/(@include/@except)` work with elements inherited from a subclass?

[joeytakeda]

When trying to exclude an element from a content model, one can use @except to include all but one or more elements (much like in moduleRef):

<content>
    <classRef key="model.biblLike" except="biblStruct"/>
<content>

But this only works with elements that are direct members of that class. E.g. trying to do the same with model.inter (which includes model.biblLike) does not work:

<content>
    <classRef key="model.inter" except="biblStruct"/>
</content>

Going the other way similarly doesn't work:

<content>
    <classRef key="model.inter" include="biblStruct"/>
</content>

I can't seem to find any description in the GLs that say whether it should or not (and I know this would be mightily complicated to do), but it would be a nice thing to have (especially since the content models and inheritance can become gnarly)

[joeytakeda]

PS: Here's the little sample schemaSpec that I've been using to play around with this:

      <schemaSpec ident="oddex1" start="places">
        
 
        <classSpec ident="model.place" type="model" module="test">
          <desc>Place-like</desc>          
        </classSpec>
        
        <classSpec ident="model.province" type="model" module="test">
            <classes>
              <memberOf key="model.place"/>
            </classes>
        </classSpec>
        
        <classSpec ident="model.animal" type="model" module="test">
          <desc>Animals</desc>
        </classSpec>
        
        <classSpec ident="model.animal.domestic" type="model" module="test">
          <desc>Domestic Animals</desc>
          <classes>
            <memberOf key="model.animal"/>
          </classes>
        </classSpec>
        
        <elementSpec ident="places" module="test">
          <content>
            <classRef key="model.place"/>
          </content>
        </elementSpec>

        
        <elementSpec ident="britishColumbia" module="test">
          <classes>
            <memberOf key="model.province"/>
          </classes>
          <content>
            <alternate minOccurs="0" maxOccurs="unbounded">
              <classRef key="model.animal" 
               />
              <elementRef key="vancouver"/>
            </alternate>      
          </content>
        </elementSpec>
        
        <elementSpec ident="alberta" module="test">
          <classes>
            <memberOf key="model.province"/>
          </classes>
          <content>
            <alternate minOccurs="0" maxOccurs="unbounded">
              <classRef key="model.animal" except="orca"/>
              <elementRef key="calgary"/>
            </alternate>
          </content>
        </elementSpec>
        
        <elementSpec ident="vancouver" module="test">
          <classes>
            <memberOf key="model.place"/>
          </classes>
          <content>
            <alternate  minOccurs="0" maxOccurs="unbounded">
              <classRef key="model.animal" />
              <elementRef key="myHouse"/>
            </alternate>      
          </content>
        </elementSpec>
        
        <elementSpec ident="calgary" module="test">
          <classes>
            <memberOf key="model.place"/>
          </classes>
          <content>
             <classRef key="model.animal" except="rat"/>
          </content>
        </elementSpec>
        
        <elementSpec ident="myHouse" module="test">
          <content>
            <classRef key="model.animal" 
              minOccurs="2" maxOccurs="unbounded" 
              include="cat"/>
          </content>
        </elementSpec>
        
       
        <elementSpec ident="orca" module="test">
          <classes>
            <memberOf key="model.animal"/>
          </classes>
        </elementSpec>
        
        <elementSpec ident="bear" module="test">
          <classes>
            <memberOf key="model.animal"/>
          </classes>
        </elementSpec>
        
        <elementSpec ident="moose" module="test">
          <classes>
            <memberOf key="model.animal"/>
          </classes>
        </elementSpec>
        
        <elementSpec ident="rat" module="test">
          <classes>
            <memberOf key="model.animal.domestic"/>
          </classes>
        </elementSpec>
        
        <elementSpec ident="cat" module="test">
          <classes>
            <memberOf key="model.animal.domestic"/>
          </classes>
        </elementSpec>
        
        <elementSpec ident="dog" module="test">
          <classes>
            <memberOf key="model.animal.domestic"/>
          </classes>
        </elementSpec>
        
        
      </schemaSpec>

[joeytakeda]

Excluding classes also does not work -- so this workaround does not produce anything (and just removes model.inter from the RNG entirely)

<content>
   <alternate minOccurs="0" maxOccurs="unbounded">
       <classRef key="model.inter" except="model.biblLike"/>
       <classRef key="model.biblLike" except="biblStruct"/>
    </alternate>
<content>