A university may contain many university units. A library may have a set of catalogues, and a set of staff members. An administrative entity may contain a set of staff members. Research entity is not considered as a subclass of university unit because a research entity can be part of many universities or can be a totally independent organism. Finally we can distinguish relations between entities.
All entities contain a timestamp attribute in order to store date and time of last modification.
This attribute will provide an effective mechanism for a customised indexing robot to decide whether a previously inserted entity-instance has changed or not, and may be updated or not. The same case applies for forms-based manual input. For security reasons queries are actually generated on the server-side. The system comprises more than 100 rules used intensively in order to control referential integrity, constraints, uniqueness of sets, automatic actualisation of object references and hypertext links. These meta tags can be generated automatically by the UniGuide Meta tag Generator.