The third one, which could be called the “end-user librarian”,
is a profile with a deep knowledge of the information needs and
applications of the selected user community, allowing her to
provide input to the digital librarian on one side and to assist the
library users on the other, by providing reference services
(possibly using web search engines) and assistance in the use of
the new functionality made available by the digital library, such
as annotations and co-laboratories.