<elementDecl ident="list" module="core">
<classes>
 <memberOf key="tei.typed"/>
</classes>
<!--... -->
<attDef ident="type" mode="replace">
<valList>
<valItem ident="ordered">Items are ordered</valItem>
<valItem ident="bulleted">Items are bulleted</valItem>
<valItem ident="frabjous">Items are frabjous</valItem>
</valList>
</attDef>
</elementDecl>

... not as easy as it looks (lazy evaluation rules)