11. The search engine according to claim 9 in which the semantic rule engine is arranged to request approval from a rule generating user of generated rules.
11. The search engine according to claim 9 in which the semantic rule engine is arranged to request approval from a rule generating user of generated rules. 12. The search engine according to claim 11 in which the semantic rule engine is arranged to display to the user at least one of a document affected by the rule and a summary of affected documents before requesting approval from the rule generating user.