It is a really interesting question. Clifford Lynch's famous
definition of a repository being a set of services is something I don't feel
that comfortable with myself. Practically, I think that Jenny is right in
saying above that it's pretty much what you make it. The question has been
phrased here in terms of content, but it is also a question of its structure,
functionality -- and services.
Having said that, if you do need to define an institutional repository, then
the way that repositories have grown have typically meant that more and more
functionality is being asked of them and because of that, the definition has
tended to expand and become woolly. In the end I am quite keen to keep the
association with open access, because all of the other things -- research
management systems, catalogues, bibliographic databases, publication databases,
virtual learning environments, databases, archives, whose functionality is now
being added into a repository all have their own distinct names and functions.
For me, I think that to be a repository it has to be based on maximising its
full-text holdings of research material and making them openly accessible.
For me, that is the core and a working definition: it can have other
features, services, etc but those are the things which are built on, rather
than being the repository at heart.
Bill