I have in one of my project a system that list European Commision funded health projects (http://ec.europa.eu/chafea/projects/database.html);
Each project is associated to one or several meshterms and/or specific topics.
The meshterms/topics are arranged with a multilevel hierachy (Parent/Child records).
One project can be assocatied to a lowest level term (i.e. Botulism) or to an intermediate level term (i.e. Communicable diseases).
The client request that system displays a selected term and his ancestors.
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