R2RML Views for unique blank nodes

One of the key issues from today's working group discussion was whether the
Direct Mapping of a table with duplicate rows could be represented in
R2RML. The observation was made that it cannot be represented in R2RML. Is
this still the case if R2RML Views are considered? It seems to me that in
many cases a Direct Mapping of a table with duplicate rows could be
represented in R2RML with an R2RML View. I think that is a reasonable way
to handle the issue in the case of a custom mapping, perhaps it could be
used for the Direct Mapping as well? I suppose this might not be acceptable
to some if it relied on vendor specific SQL.

-David