Many implementations of tools were shown, which allowed an easy creation of Metadata in different fields of research and use. This third workshop will show that the use of Metadata makes real sense in daily praxis. So, the topic of this workshop in Bonn will be to show implementations, especially search-engines. So, one can say that the idea of web-publishing in Physics is older than the web.
Centralized databases are the oldest electronic information sources.
There are databases containing the data of results of experiments and others which contain an electronic version of a traditionally printed article. Most of these databases are of high cost for the user as a result of extensive work which is done to increase the qualitiy of the offered information. But very often some information is offered free of cost, so the user can decide, if the information searched for can be found in the datasource. The need of fast communication in Physics was the reason for sending PrePrints of an article to colleagues, before the article was published in a journal. This praxis founded by Enrico Fermi who sent the first PrePrint in 1946.