There is provided a process for predicting whether a query will produce a result in an information system formed of objects having different instances and relations between the objects. An instance-to-object bitmap is computed off-line, before queries are generated by a user: the bitmap is used to represent...http://www.google.es/patents/US6502094?utm_source=gb-gplus-sharePatente US6502094 - Relation path viability prediction
