IBM-DM-015: Type property of element and attribute nodes

Data Model Section 6.2.4 (Element Nodes--Construction from a PSVI) and 
Section 6.3.4 (Attribute Nodes--Construction from a PSVI): Each of these 
sections has a rule about mapping the "type" property, but the rules are 
not the same. The element rule depends on whether the [validity] property 
exists and is "valid" on this element and all its ancestors. The attribute 
rule depends on whether the [validity] property fails to exist on this 
node or any of its ancestors, regardless of its value. What is the reason 
for this difference? It looks like a bug. It would be helpful if the rules 
were stated using the same language.