Abfragesprachen und erweiterte Suchfunktionen von WWW-Suchmaschinen

This article presents the extended search possibilities in the most important search engines. It concerns Google, Alta Vista, Hotbot (Inktomi), Teoma and Fireball. The quality of search engines is usually compared by retrieval tests. Against the background of professional demands on the abilities of search engines however their query languages must be regarded additionally. Only perfected query languages permit complex retrieval as placed in a professional sphere.