1. 1 LeMO: A Virtual Exhibition of 20th Century German History Lutz Nentwig Fraunhofer Institute for Software and Systems Engineering ISST, Berlin in cooperation with: German Historical Museum, Berlin Haus der Geschichte of the Federal Republic of Germany, Bonn LeMO was funded by DFN-Society / Deutsche Telekom Berkom GmbH

2. 2 Contents Introduction Structuring content and access: VRML, HTML, search engine Architecture, Implementation Results Outlook Conclusion Demonstration

3. 3 Introduction Virtual exhibition of 20th century German history for the Internet / B-WiN Content: Film and sound material Image material (photos, paintings, graphics etc.) Printed material (books, newspapers, posters etc.) Period objects (vehicles, clothing, furniture etc.)

4. 4 Structuring Content and Access 20th century divided into 9 periods Wilhelmine Germany (1900-1914), World War One (1914- 1918), Weimar Republic (1918-1933), National Socialism (1933-1939), World War Two and the Holocaust (1939- 1945), Post War Years (1945-1949), Divided Germany (1949-1989), German Unity (1989/1990), Approaches to the Present (since 1990) Access: 3D (VRML) worlds, HTML, search engine

5. 5 3D Environments VRML worlds for every period Information environments Atmospheric environments

6. 6 Examples VRML worlds

7. 7 HTML Content: Text, photos of historical items, film and sound recordings Links: topics in-depth, biographies, chronicles, period before, after, navigation page

8. 8 Example HTML

9. 9 Search Engine Based on metadata Search dimensions: place, time, keywords (e.g. persons), topics (politics, economy, culture etc.), data formats (VRML, HTML, jpg, video, audio etc.), objects (posters, sculptures, paintings, artifacts etc.) Graphical interface Archive

10. 10 Implementation Use of Internet technologies Integration of VRML, HTML, JavaScript, Java Streaming Video / Streaming Audio Search engine: MeBro High- / Low-End-Version

11. 11 Architecture Browser Pug-In Applets VRML HTML Java Video/Audio WWWMeta Database Video Audio HTTP Streaming Protocol IP Protocols B-WiN / Internet Client Server

12. 12 Results 31 VRML environments, over 4000 multimedia HTML pages including over 1000 texts on specific periods, themes or overviews, over 2500 images, over 700 biographies, 99 chronicles, over 260 videos /audio files Full text search engine, limited extent via an archive Pilot project: VRML worlds: up to 5 Mbyte, videos: up to 300 Kbit/s Multimedia PC, 2 Mbit/s Internet connection

13. 13 Outlook LeMO+ Metadata based search engine Guided tours Collective memory Use in schools LeMO+ is funded by DFN-Society / BMBF.

14. 14 Conclusion Experiencing history using a new medium Available to everyone worldwide, but only in one place worldwide: the Internet www.dhm.de/lemo www.hdg.de/lemo www.isst.fhg.de/~lemo