Rich Tags: cross repository browsing
categories can be unhelpful, if you don’t know it (LOC!) hard to see relate articles.
solution, unified categories across repositories. Automated.
aggregated data from oai, then got more from external sources.
instution name from whois, decade from date.
tf-idf, algorithm for categories (?)
mSpace, ecs project.
richtags.org, example of above, with records from various universities.
categories come from dmoz