This means that the resource description can be targeted at the core audience for that gateway. For example, a document on the legal implications of smoking may be described from a legal perspective for entry into a legal resource discovery system, while it could be described from a medical perspective for entry into a medical resource discovery system. This leaves us with the problem of cross searching. However, we are now entering the age of the Resource Discovery Network, and Hubs. This is where things get interesting.
Someone is interested in the legal implications of smoking and lung cancer.
Unless you have strictly restricted your media and news coverage to some of the more cerebral outlets over the last few months, you cannot have failed to notice the hysteria over genetically modified foods. However, most resource discovery systems that covered politics would still probably catalogue the party, geographic relevance and content willing, despite its partisan views. Again, a partisan view, and many biomedical resource discovery systems of repute would avoid the resource. Thankfully, we don't have to make up these decisions as we go along. Criteria has been developed via which people can assess Internet-based resources, for inclusion into resource discovery systems.