27. internet search federated search (metasearch) index data base search query-generator / answer collector index files search index data base search index files search index data base search index files search Z39.50 Z39.50 sru sru http http xml Z39.50 http configuration data of targets
28.
29. indexer internet local resources (metadata?) external resources (websites?) central index search integrated search (local search engine with central index) indexing rules full-text links
30. example of integrated search solution developed at university library utrecht