Hierarchical Subject SearchCurate a structured list of search topics

Subject hierarchy versus tagging

A subject hierarchy differs from standard keyword tagging in that standard users can not add their own subjects, but instead they must choose from a list of pre-selected subjects. This maintains data integrity but also relies on a dedicated curator being available to maintain the subject hierarchy.

When carring out a subject search, users are presented with the hierarchy of subjects, which allows them to easily see the topics which are covered by the collection.