Clarification needed on attribute names without namespace prefix

I need some clarification on the attribute names without namespace prefix.

Current XML Namespace spec says that attribute without namespace are put under a per-element-type partition in Appendix A.2 and illustrate the point further with samples like:
 <ExpAName name='title' eltype="book" elns="urn:com:books-r-us" /> 
 <ExpAName name='title' eltype="author" elns="urn:com:books-r-us" /> 
So I'm not clear whether the above two attribute names under different elements are the same or not.

When related to XQuery, several things needs to be clarified:
1)  does @title retrieve both attributes?
2)  should book/@title be allowed to copied to author/@title?
3)  does fn:node-name(book/@title) return the same xs:Qname as fn:node-name(author/@title)?
If the answers are yes to all three questions, then I think the so called 
    expanded QName in XQuery for book/@title and author/@title are exactly the same.

Then the description of the ExpAName in XML Namespace is very confusing and seems to give the impression that they are different.

Regards

Henry